Fair Value Disclosures [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Recurring Fair Value, Measurements, Recurring [Member] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Axis] Major Types of Debt and Equity Securities [Domain] Major Types of Debt and Equity Securities [Domain] U.S. government and agency US Government Agencies Debt Securities [Member] Non-U.S. government Foreign Government Debt Securities [Member] Corporate Corporate Debt Securities [Member] Municipal Municipal Bonds [Member] Residential mortgage-backed Residential Mortgage Backed Securities [Member] Commercial mortgage-backed Commercial Mortgage Backed Securities [Member] Asset-backed Asset-backed Securities [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Quoted Prices in Active Markets for Identical Assets (Level 1) Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) Fair Value, Inputs, Level 2 [Member] Significant Unobservable Inputs (Level 3) Fair Value, Inputs, Level 3 [Member] Investment Type [Axis] Investment Type [Axis] Investments [Domain] Investments [Domain] Equity Securities Equity Securities [Member] Other investments Other Investments [Member] Funds held - directly managed Funds Held - Directly Managed [Member] Funds Held - Directly Managed [Member] Geographical [Axis] Geographical [Axis] Geographical [Domain] Geographical [Domain] US UNITED STATES Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Assets, Fair Value Disclosure [Abstract] Assets, Fair Value Disclosure [Abstract] Total investments Investments, Fair Value Disclosure Other investments Investments, Excluding Net Asset Value, Fair Value Disclosure Investments, Excluding Net Asset Value, Fair Value Disclosure Fair Value Trading Securities, Debt Other funds held assets Funds Held, Directly Managed, Other Assets Funds Held, Directly Managed, Other Assets Funds held - directly managed Funds Held under Reinsurance Agreements, Directly Managed, Net Asset Funds Held under Reinsurance Agreements, Directly Managed, Net Asset Reinsurance recoverable Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Fair Value Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Fair Value Derivative instruments Derivative Asset Liabilities, Fair Value Disclosure [Abstract] Liabilities, Fair Value Disclosure [Abstract] Losses and LAE Liability for Claims and Claims Adjustment Expense, Fair Value Liability for Claims and Claims Adjustment Expense, Fair Value Derivative instruments Derivative Liability Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Other Investments Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Other investments Other investments measured at NAV as practical expedient Alternative Investments, Fair Value Disclosure Total other investments shown on balance sheets Investments, Debt and Equity Securities [Abstract] Investment Income [Table] Investment Income [Table] Asset Class [Axis] Asset Class [Axis] Asset Class [Domain] Asset Class [Domain] Fixed Maturities [Member] Fixed Maturities [Member] Short-term investments and cash and cash equivalents Short Term Investments And Cash Equivalents [Member] Short Term Investments And Cash Equivalents [Member] Net Investment Income [Line Items] Net Investment Income [Line Items] Gross investment income Gross Investment Income, Operating Investment expenses Investment Income, Investment Expense Net investment income Net Investment Income Document And Entity Information [Abstract] Document And Entity Information [Abstract] Document Information [Table] Document Information [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Voting Common Stock Voting Common Stock [Member] Voting Common Stock. Non-Voting Convertible Ordinary Shares Nonvoting Common Stock [Member] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Entity Central Index Key Entity Central Index Key Trading Symbol Trading Symbol Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Related Party Transactions [Abstract] Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Investment, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] KaylaRe Holdings Ltd KaylaRe Holdings Ltd [Member] KaylaRe Holdings Ltd. [Member] Counterparty Name [Axis] Counterparty Name [Axis] Counterparty Name [Domain] Counterparty Name [Domain] Hillhouse Hillhouse [Member] Hillhouse [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Hillhouse Affiliates Hillhouse Affiliates [Member] Hillhouse Affiliates [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Affiliated Entity Affiliated Entity [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Ownership percentage Common Stock Ownership Percentage Common Stock Ownership Percentage Economic interest percentage Common Stock Economic Ownership Percentage Common Stock Economic Ownership Percentage Other investments Other Investments Schedule of Gain (Loss) on Investments [Table] Schedule of Gain (Loss) on Investments [Table] Fixed maturity securities Debt Securities [Member] Equity securities Funds held - directly managed Gain (Loss) on Investments [Line Items] Gain (Loss) on Investments [Line Items] Gross realized gains on fixed maturity securities, available-for-sale Available-for-sale Securities, Gross Realized Gains Gross realized losses on fixed maturity securities, available-for-sale Available-for-sale Securities, Gross Realized Losses Net realized losses on fixed maturity securities Trading Securities, Realized Gain (Loss) Total net realized gains (losses) on sale Gain (Loss) on Sale of Investments Net unrealized gains (losses) on trading securities Trading Securities, Change in Unrealized Holding Gain (Loss) Other investments Unrealized Gain (Loss) on Investments Change in fair value of embedded derivative Gain (Loss) on Embedded Derivative on Funds Held Directly Managed Gain (Loss) on Embedded Derivative on Funds Held Directly Managed Change in value of fair value option on funds held - directly managed Gain (Loss) Fair Value Option on Funds Held Directly Managed Gain (Loss) Fair Value Option on Funds Held Directly Managed Total net unrealized gains Marketable Securities, Unrealized Gain (Loss) Net realized and unrealized gains (losses) Gain (Loss) on Investments Proceeds from sales of available-for-sale securities Proceeds from Sale of Available-for-sale Securities Discontinued Operations and Disposal Groups [Abstract] Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Group Name [Domain] Disposal Group Name [Domain] Pavonia Pavonia [Member] Pavonia [Member] Disposal Group Classification [Axis] Disposal Group Classification [Axis] Disposal Group Classification [Domain] Disposal Group Classification [Domain] Discontinued Operations, Held-for-sale Discontinued Operations, Held-for-sale [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Disposal, consideration Disposal Group, Including Discontinued Operation, Consideration Disposal, restricted investments Disposal Group, Including Discontinued Operation, Restricted Investments Disposal Group, Including Discontinued Operation, Restricted Investments CTA balance related to disposal Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Organization, Consolidation and Presentation of Financial Statements [Abstract] Schedule of Guarantor Obligations [Table] Schedule of Guarantor Obligations [Table] RSA Insurance Group PLC [Member] RSA Insurance Group PLC [Member] RSA Insurance Group PLC [Member] QBE Insurance Group Limited QBE Insurance Group Limited [Member] QBE Insurance Group Limited [Member] Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Assumed business Liability For Unpaid Claims And Claims Adjustment Expense, Assumed Business Liability For Unpaid Claims And Claims Adjustment Expense, Assumed Business Net insurance reserves assumed Liability For Unpaid Claims And Claims Adjustment Expense, Assumed Business, Net Liability For Unpaid Claims And Claims Adjustment Expense, Assumed Business, Net Reinsurance premium payable Reinsurance Premiums Receivable Reinsurance Premiums Receivable Fair value adjustment on gross reserves Liability For Unpaid Claims And Claims Adjustment Expense, Gross, Fair Value Adjustments Liability For Unpaid Claims And Claims Adjustment Expense, Gross, Fair Value Adjustments Fair value adjustment on net reserves Liability For Unpaid Claims And Claims Adjustment Expense, Net, Fair Value Adjustments Liability For Unpaid Claims And Claims Adjustment Expense, Net, Fair Value Adjustments Categorized Investments Recorded at Fair Value among Levels Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Fair Value, Investments, Entities that Calculate Net Asset Value Per Share Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block] Reconciliation for Assets Measured at Fair Value on a Recurring Basis Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Reconciliation for Liabilities Measured at Fair Value on a Recurring Basis Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Quantitative Information Fair Value, Option, Quantitative Disclosures [Table Text Block] Statement of Comprehensive Income [Abstract] NET EARNINGS Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive income, net of tax: Other Comprehensive Income (Loss), Net of Tax [Abstract] Unrealized holding gains on fixed income investments arising during the period Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax Reclassification adjustment for net realized gains included in net earnings Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax Unrealized gains arising during the period, net of reclassification adjustment Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, Net of Tax Currency translation adjustment Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax Total other comprehensive income Other Comprehensive Income (Loss), Net of Tax Comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Less comprehensive income attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest COMPREHENSIVE INCOME ATTRIBUTABLE TO ENSTAR GROUP LIMITED Comprehensive Income (Loss), Net of Tax, Attributable to Parent Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Hedging Relationship [Axis] Hedging Relationship [Axis] Hedging Relationship [Domain] Hedging Relationship [Domain] Net investment hedging Net Investment Hedging [Member] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Designated as hedging instrument Designated as Hedging Instrument [Member] Not designated as hedging instrument Not Designated as Hedging Instrument [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Foreign exchange forward Foreign Exchange Forward [Member] Currency [Axis] Currency [Axis] All Currencies [Domain] All Currencies [Domain] AUD Australia, Dollars CAD Canada, Dollars GBP United Kingdom, Pounds EUR Euro Member Countries, Euro Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] EGL Revolving Credit Facility EGL Revolving Credit Facility [Member] EGL revolving credit facility. Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Line of Credit Line of Credit [Member] Derivative [Line Items] Derivative [Line Items] Gross Notional Amount Derivative, Notional Amount Assets Liabilities Amount of Gains (Losses) Deferred in AOCI (Effective Portion) Gain (Loss) on Derivative Used in Net Investment Hedge, Net of Tax Losses on non-qualifying hedges charged to earnings Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Proceeds from line of credit Proceeds from Long-term Lines of Credit Segment Reporting [Abstract] Number of segments Number of Operating Segments Insurance [Abstract] Effects of Reinsurance [Table] Effects of Reinsurance [Table] Ceded Credit Risk, Collateralization [Axis] Ceded Credit Risk, Collateralization [Axis] Ceded Credit Risk, Collateralization [Domain] Ceded Credit Risk, Collateralization [Domain] Secured Ceded Credit Risk, Secured [Member] Unsecured Ceded Credit Risk, Unsecured [Member] Ceded Credit Risk, Reinsurer [Axis] Ceded Credit Risk, Reinsurer [Axis] Ceded Credit Risk, Reinsurer [Domain] Ceded Credit Risk, Reinsurer [Domain] Reinsurers rated A- or above Reinsurers Rated A Minus Or Above [Member] Reinsurers rated A minus or above. Reinsurers rated below A- Reinsurers Rated Below A Minus [Member] Reinsurers Rated Below A Minus [Member] Effects of Reinsurance [Line Items] Effects of Reinsurance [Line Items] Gross Reinsurance Recoverables, Gross Provisions for Bad Debt Reinsurance Recoverables, Allowance Net Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments Provisions as a % of Gross Percentage of Reinsurance Recoverables Allowance to Reinsurance Recoverables Gross Percentage of Reinsurance Recoverables Allowance to Reinsurance Recoverables Gross POLICY BENEFITS FOR LIFE AND ANNUITY CONTRACTS Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Non-Life Run-Off Non-Life Run-Off Segment [Member] Non-Life Run-Off Company Segment [Member] Atrium Atrium Segment [Member] Atrium Segment [Member] StarStone StarStone Segment [Member] StarStone Segment [Member] Life and Annuities Segment Life and Annuities Segment [Member] Life and Annuities Segment [Member] Outstanding losses Reinsurance Recoverable for Unpaid Claims and Claims Adjustments IBNR Reinsurance Recoverables, Incurred but Not Reported Claims Fair value adjustments Reinsurance Recoverable, Fair Value Adjustment, at Cost Reinsurance Recoverable, Fair Value Adjustment, at Cost Fair value adjustments - fair value option Reinsurance Recoverable, Fair Value Adjustment, at Fair Value Reinsurance Recoverable, Fair Value Adjustment, at Fair Value Total reinsurance reserves recoverable Reinsurance Recoverable, Before Paid Claims Reinsurance Recoverable, Before Paid Claims Paid losses recoverable Reinsurance Recoverable for Paid Claims and Claims Adjustments Reinsurance balances recoverable Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Cost Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments, Cost Reinsurance balances recoverable, at fair value Equity Method Investee Equity Method Investee [Member] Non-Life Run-Off Non-Life Run-Off and StarStone Segment [Member] Non-Life Run-Off and StarStone Segment [Member] Concentration Risk Type [Axis] Concentration Risk Type [Axis] Concentration Risk Type [Domain] Concentration Risk Type [Domain] Reinsurer Concentration Risk Reinsurer Concentration Risk [Member] Top Ten Reinsurers, Rated A Minus Or Higher Top Ten Reinsurers, Rated A Minus Or Higher [Member] Top Ten Reinsurers, Rated A Minus Or Higher [Member] Top Ten Reinsurers, Five Non-Rated Reinsurers Top Ten Reinsurers, Five Non-Rated Reinsurers [Member] Top Ten Reinsurers, Five Non-Rated Reinsurers [Member] Top Ten Reinsurers, Three Non-Rated Reinsurers Top Ten Reinsurers, Four Non-Rated Reinsurers [Member] Top Ten Reinsurers, Four Non-Rated Reinsurers [Member] Lloyd's Syndicates Lloyd's Syndicate [Member] Lloyd's Syndicate [Member] Hannover Ruck SE Hannover Ruck SE [Member] Hannover Ruck SE [Member] Reinsurance balances recoverable Increase (decrease) in reinsurance recoverable Increase (Decrease) in Reinsurance Recoverable Number of external reinsurers Number of External Reinsurers Number of External Reinsurers Commitments and Contingencies Disclosure [Abstract] Environmental Remediation Contingency [Axis] Environmental Remediation Contingency [Axis] Environmental Remediation Contingency [Domain] Environmental Remediation Contingency [Domain] Asbestos personal injury liabilities Reserve for Asbestos Loss [Member] Reserve for Asbestos Loss [Member] Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Dana properties Dana Companies, LLC [Member] Dana Companies, LLC [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Reinsurance Recoverables Reinsurance Recoverable [Member] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Limited Parental Guarantee Limited Parental Guarantee [Member] Limited Parental Guarantee [Member] Funds held by reinsured companies Funds Held under Reinsurance Agreements, Asset Commitments, unfunded Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Unfunded Commitments Total parental guarantees Guarantor Obligations, Current Carrying Value Indemnity and defense costs Liability for Asbestos and Environmental Claims, Gross Insurance recoveries receivable Insurance Settlements Receivable Income Tax Disclosure [Abstract] TAXATION Income Tax Disclosure [Text Block] Gross, premiums written Premiums Written, Gross Ceded, premiums written Ceded Premiums Written Net, premiums written Premiums Written, Net Gross, premiums earned Direct Premiums Earned Ceded, premiums earned Ceded Premiums Earned Net, premiums earned Premiums Earned, Net Debt Disclosure [Abstract] Amounts of Loans Payable Outstanding, and Accrued Interest Schedule of Long-term Debt Instruments [Table Text Block] Statement of Stockholders' Equity [Abstract] Statement [Table] Statement [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Ordinary Shares Common Stock [Member] Preferred Stock Preferred Stock [Member] Treasury Shares Treasury Stock [Member] Additional Paid-in Capital Additional Paid-in Capital [Member] Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Currency translation adjustment Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Defined benefit pension liability Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Unrealized gains (losses) on investments Accumulated Net Investment Gain (Loss) Attributable to Parent [Member] Retained Earnings Retained Earnings [Member] Noncontrolling Interest (excludes Redeemable Noncontrolling Interest) Noncontrolling Interest [Member] Foreign currency translation adjustments Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest [Member] Series A Non-Voting Convertible Ordinary Shares Common Class A [Member] Series C Non-Voting Convertible Ordinary Shares Common Class C [Member] Series E Non-Voting Convertible Ordinary Shares Common Class E [Member] Common Class E [Member] Series C Preferred Shares Series C Preferred Stock [Member] Statement [Line Items] Statement [Line Items] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Balance, beginning of period Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Issue of shares Stock Issued During Period, Value, New Issues Conversion of shares Stock Issued During Period, Value, Conversion of Convertible Securities Issue of shares and warrants Adjustments to Additional Paid in Capital, Stock and Warrant Issued Adjustments to Additional Paid in Capital, Stock and Warrant Issued Amortization of equity incentive plan Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition Accretion of redeemable noncontrolling interests to redemption value Increase in Carrying Amount of Redeemable Preferred Stock Change in other comprehensive income (loss) Cumulative effect of change in accounting principle Cumulative Effect of New Accounting Principle in Period of Adoption Net earnings (losses) Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest Balance, end of period Other Investments [Table] Other Investments [Table] Other Investments Private equities and private equity funds Private Equity Funds [Member] Fixed income funds Fixed Income Funds [Member] Fixed income hedge funds Hedge Funds, Fixed Income [Member] Hedge Funds, Fixed Income [Member] Equity funds Equity Funds [Member] CLO equities CLO Equity [Member] CLO Equity [Member] CLO equity funds CLO Equity Funds [Member] CLO Equity Funds [Member] Other Other Long-term Investments [Member] CLO Equity Fund One CLO Equity Fund One [Member] CLO Equity Fund One [Member] CLO Equity Fund Two CLO Equity Fund Two [Member] CLO Equity Fund Two [Member] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum Minimum [Member] Maximum Maximum [Member] Other Investments [Line Items] Other Investments [Line Items] [Line Items] for Other Investments Other investments, at fair value Valuation lag period Other Investments, Valuation Lag Period Other Investments, Valuation Lag Period Imposed lock-up period (up to) (years) Fair Value, Investments, Entities that Calculate Net Asset Value Per Share, Redemption Restriction, Period in Effect Number of days to give notice for quarterly hedge fund redemptions Notice Period For Redemption Of Hedge Fund Notice period for redemption of hedge fund. Number of CLO equity funds Other Investments, Number of Funds Number of Funds Invested in Equity Tranches of Term-Financed Securitizations of Diversified Pools of Corporate Bank Loans CLO equity fund pay out period (years) Other Investments, Fund Payout Period Equity Fund, Payout Period Gates or side-pocket investments Investment, Fair Value Disclosure, Subject to Gates or Side Pocket Restrictions Investment, Fair Value Disclosure, Subject to Gates or Side Pocket Restrictions Unfunded commitments Trading Securities [Table] Trading Securities [Table] Residential mortgage-backed Asset-backed Schedule of Trading Securities and Other Trading Assets [Line Items] Schedule of Trading Securities and Other Trading Assets [Line Items] Amortized Cost Trading Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract] Trading Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract] One year or less Trading Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Trading securities debt maturities within one year amortized cost. More than one year through two years Trading Securities, Debt Maturities, Rolling Year Two, Amortized Cost Trading securities debt maturities after one through two years amortized cost. More than two years through five years Trading Securities, Debt Maturities, Rolling Year Three Through Five, Amortized Cost Trading securities debt maturities after two years through five years amortized cost. More than five years through ten years Trading Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost Trading Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost More than ten years Trading Securities, Debt Maturities, Rolling after Ten Years, Amortized Cost Trading securities debt maturities after ten years amortized cost. Securities without single maturity date Trading Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis Trading Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis Trading securities, amortized cost Trading Securities, Debt, Amortized Cost Fair Value Trading Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] Trading Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract] One year or less Trading Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value Trading Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value More than one year through two years Trading Securities, Debt Maturities, Rolling Year Two, Fair Value Trading securities debt maturities after one through two years fair value. More than two years through five years Trading Securities, Debt Maturities, Rolling Year Three Through Five, Fair Value Trading securities debt maturities after two years through five years fair value. More than five years through ten years Trading Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value Trading securities debt maturities after five years through ten years fair value. More than ten years Trading Securities, Debt Maturities, Rolling after Ten Years, Fair Value Trading securities debt maturities after ten years fair value. Securities without single maturity date Trading Securities, Debt Maturities, without Single Maturity Date, Fair Value Trading Securities, Debt Maturities, without Single Maturity Date, Fair Value Trading securities, debt % of Total Fair Value Trading Securities, Debt Maturities, Percent of Total Fair Value, Rolling Maturity [Abstract] Trading Securities, Debt Maturities, Percent of Total Fair Value, Rolling Maturity [Abstract] One year or less Trading Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value, Percent Trading securities debt maturities within one year percent of fair value. More than one year through two years Trading Securities, Debt Maturities, Rolling Year Two, Fair Value, Percent Trading securities debt maturities after one year through two years percent fair value. More than two years through five years Trading Securities, Debt Maturities, Rolling Year Three Through Five, Fair Value, Percent Trading securities debt maturities after two years through five years percent of fair value. More than five years through ten years Trading Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value, Percent Trading securities debt maturities five years through ten years percent of fair value. More than ten years Trading Securities, Debt Maturities, Rolling after Ten Years, Fair Value, Percent Trading securities debt maturities after ten years percent of fair value. Securities without single maturity date Trading Securities, Debt Maturities, without Single Maturity Date, Fair Value, Percent Trading securities percentage of fair value. Trading securities, percentage of fair value Trading Securities, Percentage Of Fair Value Trading Securities, Percentage Of Fair Value Goodwill, Intangible Assets, Intangible Assets Arising from Insurance Contracts Acquired in Business Combination, and Deferred Charges Disclosure [Abstract] Goodwill, Intangible Assets, Intangible Assets Arising from Insurance Contracts Acquired in Business Combination, and Deferred Charges Disclosure [Abstract] Amortization of intangible assets Amortization of Deferred Charges Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Table] Schedule of Available-for-sale Securities [Line Items] Schedule of Available-for-sale Securities [Line Items] Amortized Cost Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis, Rolling Maturity [Abstract] One year or less Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Amortized Cost Basis More than one year through two years Available-for-sale Securities, Debt Maturities, Rolling Year Two, Amortized Cost Basis Available-for-sale Securities, Debt Maturities, Rolling Year Two, Amortized Cost Basis More than two years through five years Available-for-sale Securities, Debt Maturities, Rolling Year Three Through Five, Amortized Cost Basis Available-for-sale Securities, Debt Maturities, Rolling Year Three Through Five, Amortized Cost Basis More than five years through ten years Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Amortized Cost Basis More than ten years Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Amortized Cost Basis Securities without single maturity date Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis Amortized Cost Available-for-sale Debt Securities, Amortized Cost Basis Fair Value Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity [Abstract] One year or less Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value More than one year through two years Available-for-sale Securities, Debt Maturities, Rolling Year Two, Fair Value Available-for-sale Securities, Debt Maturities, Rolling Year Two, Fair Value More than two years through five years Available-for-sale Securities, Debt Maturities, Rolling Year Three Through Five, Fair Value Available-for-sale Securities, Debt Maturities, Rolling Year Three Through Five, Fair Value More than five years through ten years Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value More than ten years Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Fair Value Securities without single maturity date Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value Fair Value Available-for-sale Securities, Debt Securities % of Total Fair Value Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity, Percent of Fair Value [Abstract] Available-for-sale Securities, Debt Maturities, Single Maturity Date, Rolling Maturity, Percent of Fair Value [Abstract] One year or less Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value, Percent Available-for-sale Securities, Debt Maturities, Next Rolling Twelve Months, Fair Value, Percent More than one year through two years Available-for-sale Securities, Debt Maturities, Rolling Year Two, Fair Value, Percent Available for sale securities debt maturities after one through two years percent of fair value. More than two years through five years Available-for-sale Securities, Debt Maturities, Rolling Year Three Through Five, Fair Value, Percent Available for sale securities debt maturities after two through five years percent of fair value. More than five years through ten years Available-for-sale Securities, Debt Maturities, Rolling Year Six Through Ten, Fair Value, Percent Available for sale securities debt maturities after five through ten years percent of fair value. More than ten years Available-for-sale Securities, Debt Maturities, Rolling after Year Ten, Fair Value, Percent Available for sale securities debt maturities after ten years percent of fair value. Securities without single maturity date Available-For-Sale Securities, Debt Maturities, Without Single Maturity Date, Fair Value, Percent Available-For-Sale Securities, Debt Maturities, Without Single Maturity Date, Fair Value, Percent Percentage of Total Fair Value Available-for-sale Securities, Debt Securities, Percent Available for sale securities debt securities percent of fair value. Trident Trident [Member] Trident [Member] Eagle Point Credit and PRIMA Capital Advisors Eagle Point Credit and PRIMA Capital Advisors [Member] Eagle Point Credit and PRIMA Capital Advisors Sound Point Capital Sound Point Capital [Member] Sound Point Capital [Member] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party Transaction [Domain] Related Party Transaction [Domain] Fund Investments Fund Investments [Member] Fund Investments [Member] Registered Investment Companies Registered Investment Company [Member] Registered Investment Company [Member] Management Fee Management Fee [Member] Management Fee [Member] Related party transaction, shares acquired Related Party Transaction Shares Acquired from Related Party Related Party Transaction Shares Acquired from Related Party Percentage of Company's voting ordinary shares acquired Related Party Transactions Percentage Of Equity Interest Acquired Related Party Transactions Percentage Of Equity Interest Acquired Number of newly elected board of directors Related Party Transaction, Number of Newly Elected Board of Directors Related Party Transaction, Number of Newly Elected Board of Directors Number of general partners Related Party Transaction, Number of General Partners Related Party Transaction, Number of General Partners Shareholders' agreement period Related Party Transaction, Agreement period Related Party Transaction, Agreement period Redeemable noncontrolling interest, redemption period one (years) Redeemable Noncontrolling Interest, Redemption Period One Redeemable Noncontrolling Interest, Redemption Period One Redeemable noncontrolling interest, redemption period two (years) Redeemable Noncontrolling Interest, Redemption Period Two Redeemable Noncontrolling Interest, Redemption Period Two Redeemable noncontrolling interest Redeemable Noncontrolling Interest, Equity, Carrying Amount Equities, trading, at fair value Trading Securities, Equity Net realized and unrealized gains Interest income Interest Income, Related Party Separate account assets Separate Account Assets Fees Related Party Transaction, Expenses from Transactions with Related Party Net unrealized gains (losses) Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Senior Notes Senior Notes [Member] Sussex Facility Sussex Facility [Member] Sussex Facility [Member] EGL Term Loan Facility EGL Term Loan Facility [Member] EGL Term Loan Facility [Member] Senior Notes Due 2022 Senior Notes Due 2022 [Member] Senior Notes Due 2022 [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Term Debt Instrument, Term Senior Notes Long-term Debt, Gross Less: Unamortized debt issuance costs Debt Issuance Costs, Net Debt obligations Long-term Debt Estimated Fair Values of Investments in Fixed Maturity Investments, Short-Term Investments and Equities, Trading Securities Trading Securities [Table Text Block] Summary of Amortized Cost and Estimated Fair Value of Fixed Maturities by Contractual Maturity Investments Classified by Contractual Maturity Date [Table Text Block] Amortized Cost and Estimated Fair Values of Company's Fixed Maturity and Short-Term Investments Classified as Available-for-Sale Available-for-sale Securities [Table Text Block] Summary of Investments Classified as Available-for-Sale in Unrealized Loss Position as Well as Aggregate Fair Value and Gross Unrealized Loss by Length of Time Schedule of Unrealized Loss on Investments [Table Text Block] Credit Ratings Company's Fixed Maturity and Short-Term Investments Available-for-Sale Schedule Of Investments by Credit Rating [Table Text Block] Schedule Of Investments by Credit Rating Other Investments Other Investments Table [Table Text Block] Other investments. Schedule of Life Settlement Contracts, Investment Method Schedule of Life Settlement Contracts, Investment Method [Table Text Block] Realized Gain (Loss) on Investments Realized Gain (Loss) on Investments [Table Text Block] Unrealized Gain (Loss) on Investments Unrealized Gain (Loss) on Investments [Table Text Block] Major Categories of Net Investment Income Investment Income [Table Text Block] Schedule of Carrying Value of Restricted Investments Schedule of Restricted Assets [Table Text Block] Schedule of Restricted Assets [Table Text Block] Schedule of Net Premiums Written and Earned Effects of Reinsurance [Table Text Block] Earnings Per Share [Abstract] Comparison of Basic and Diluted Earnings per Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Estimated Fair Value and Unrealized Gains (Losses) on Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Summary of Operations by Segment Schedule of Segment Reporting Information, by Segment [Table Text Block] Summary of Company's Assets by Segment Reconciliation of Assets from Segment to Consolidated [Table Text Block] Schedule of Funds Held, Directly Managed [Table] Schedule of Funds Held, Directly Managed [Table] Schedule of Funds Held, Directly Managed [Table] Schedule of Funds Held, Directly Managed [Line Items] Schedule of Funds Held, Directly Managed [Line Items] [Line Items] for Schedule of Funds Held, Directly Managed [Table] Amortized Cost Funds Held, Directly Managed, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] Funds Held, Directly Managed, Debt Maturities, Amortized Cost Basis, Fiscal Year Maturity [Abstract] More than one year through two years More than two years through five years More than five years through ten years More than ten years Fair Value Funds Held, Directly Managed, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] Funds Held, Directly Managed, Debt Maturities, Fair Value, Fiscal Year Maturity [Abstract] % of Total Fair Value Funds Held, Directly Managed, Debt Maturities, Fair Value, Fiscal Year Maturity, Percent [Abstract] Funds Held, Directly Managed, Debt Maturities, Fair Value, Fiscal Year Maturity, Percent [Abstract] FAIR VALUE MEASUREMENTS Fair Value Disclosures [Text Block] Restricted cash and cash equivalents Restricted Cash and Cash Equivalents Collateral in trust for third party agreements Assets Held-in-trust Assets on deposit with regulatory authorities Deposit Assets Assets on deposit with regulatory authorities Trading Securities Pledged as Collateral Funds at Lloyd's Funds in Syndicate Funds in Syndicate Restricted assets, total Restricted Cash and Investments Number of syndicates Restricted Cash and Investments, Number of Syndicates Restricted Cash and Investments, Number of Syndicates Cash and investments Funds in Syndicate, Cash and Investments Funds in Syndicate, Cash and Investments Collateral for line of credit facility Funds in Syndicate, Collateral for Line of Credit Facility Funds in Syndicate, Collateral for Line of Credit Facility Line of Credit Facility [Table] Line of Credit Facility [Table] FAL Facility FAL Facility [Member] FAL Facility [Member] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Letters of Credit Letter of Credit [Member] Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Maximum borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Higher borrowing capacity option Line of Credit Facility, Higher Borrowing Capacity Option Line of Credit Facility, Higher Borrowing Capacity Option Fair Value Inputs, Liabilities, Quantitative Information [Table] Fair Value Inputs, Liabilities, Quantitative Information [Table] Liability Class [Axis] Liability Class [Axis] Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Liability for losses and LAE Losses And Loss Adjustment Expense Liabilities [Member] Losses And Loss Adjustment Expense Liabilities [Member] Reinsurance recoverable Valuation Technique [Axis] Valuation Technique [Axis] Valuation Technique [Domain] Valuation Technique [Domain] Internal model Internal Model [Member] Internal Model [Member] Fair Value Inputs, Liabilities, Quantitative Information [Line Items] Fair Value Inputs, Liabilities, Quantitative Information [Line Items] Credit spread for non-performance risk Fair Value Inputs, Entity Credit Risk Risk cost of capital Fair Value Inputs, Risk Cost of Capital Fair Value Inputs, Risk Cost of Capital Weighted average cost of capital Fair Value Inputs, Weighted Average Cost of Capital Fair Value Inputs, Weighted Average Cost of Capital Duration Fair Value Inputs, Duration Fair Value Inputs, Duration CPPIB and Management of Wilton Re Canada Pension Plan Investment Board and Management of Wilton Re [Member] Canada Pension Plan Investment Board and Management of Wilton Re [Member] CPPIB LP CPPIB Epsilon Ontario Limited Partnership [Member] CPPIB Epsilon Ontario Limited Partnership [Member] Ownership percentage by parent Noncontrolling Interest, Ownership Percentage by Parent Reinsurance recoverables Reinsurance Recoverables, Including Reinsurance Premium Paid Policy benefits for life contracts Liability for Future Policy Benefits, Life Schedule of Goodwill, Intangible Assets and Deferred Charge Schedule of Goodwill, Intangible Assets, Intangible Assets Arising from Insurance Contracts Acquired in Business Combination, and Deferred Charges Disclosure [Table Text Block] Schedule of Goodwill, Intangible Assets, Intangible Assets Arising from Insurance Contracts Acquired in Business Combination, and Deferred Charges Disclosure [Table Text Block] Products and Services [Axis] Products and Services [Axis] Products and Services [Domain] Products and Services [Domain] Workers Compensation Business Workers Compensation Insurance Product Line [Member] Workers Compensation Insurance Product Line [Member] Net incurred losses and LAE Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Net incurred losses and LAE, current period Current Year Claims and Claims Adjustment Expense Net incurred losses and LAE, prior periods Prior Year Claims and Claims Adjustment Expense Increase (reduction) in estimates of net ultimate losses, prior period Estimates of Net Ultimate Losses, Period Increase (Decrease), Prior Years Estimates of Net Ultimate Losses, Period Increase (Decrease), Prior Years Increase (reduction) in provisions for unallocated loss adjustment expense liabilities, Prior Period Provision For Unallocated Claim Adjustment Expense, Prior Years Provision For Unallocated Claim Adjustment Expense, Prior Years Amortization of fair value adjustments, Prior Period Claims And Claims Adjustment Expense, Amortization Of Fair Value Adjustments, Prior Years Claims And Claims Adjustment Expense, Amortization Of Fair Value Adjustments, Prior Years Changes in fair value - fair value option, Prior Period Claims And Claims Adjustment Expense, Change In Fair Value, Prior Years Claims And Claims Adjustment Expense, Change In Fair Value, Prior Years Net change in case and IBNR reserves Change in Case and Loss Adjustment Expense and Liability For Unpaid Claims And Claims Adjustment Expense, Incurred But Not Reported Claims Amount, Period Increase (Decrease) Change in Case and Loss Adjustment Expense and Liability For Unpaid Claims And Claims Adjustment Expense, Incurred But Not Reported Claims Amount, Period Increase (Decrease) Amortization of deferred charge Deferred Costs, Current And Noncurrent, Amortization Deferred Costs, Current And Noncurrent, Amortization Current year premiums earned Current Year Premiums Earned, Net Current Year Premiums Earned, Net Increase (reduction) in provisions for bad debt, Prior Period Provision For Doubtful Accounts, Prior Years Provision For Doubtful Accounts, Prior Years Held-For-Sale Business Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Fair Value Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Abstract] 12 Months or Greater Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value Less Than 12 Months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value Total Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value Gross Unrealized Losses Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss [Abstract] 12 Months or Greater Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Less Than 12 Months Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Total Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss Number of securities classified as available-for-sale in an unrealized loss position Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions Number of securities classified as available-for-sale in an unrealized loss position for twelve months or longer Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions, Greater than or Equal to One Year Compensation and Retirement Disclosure [Abstract] SHARE-BASED COMPENSATION AND PENSIONS Compensation and Employee Benefit Plans [Text Block] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Operating Segments Operating Segments [Member] Eliminations Intersegment Eliminations [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] INCOME Revenues [Abstract] Net premiums earned Fees and commission income Fees and Commissions Net investment income Net realized and unrealized gains (losses) Other income Other Income Total income Revenues EXPENSES Benefits, Losses and Expenses [Abstract] Net incurred losses and LAE Life and annuity policy benefits Policyholder Benefits and Claims Incurred, Net, Life and Annuity Acquisition costs Business Combination, Acquisition Related Costs General and administrative expenses General and Administrative Expense Interest expense Interest Expense Net foreign exchange losses (gains) Foreign Currency Transaction Gain (Loss), before Tax Total expenses Benefits, Losses and Expenses EARNINGS BEFORE INCOME TAXES Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest INCOME TAXES Income Tax Expense (Benefit) NET EARNINGS FROM CONTINUING OPERATIONS Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest NET EARNINGS FROM DISCONTINUED OPERATIONS, NET OF INCOME TAX EXPENSE Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Less: Net earnings attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest NET EARNINGS ATTRIBUTABLE TO ENSTAR GROUP LIMITED Net Income (Loss) Attributable to Parent Schedule of Trading Securities and Available-for-sale Securities [Table] Schedule of Trading Securities and Available-for-sale Securities [Table] Schedule of Trading Securities and Available-for-sale Securities [Table] Credit Rating, Standard And Poor's, Fitch [Axis] Credit Rating, Standard And Poor's, Fitch [Axis] Credit Rating, Standard And Poor's, Fitch [Axis] Credit Rating, Standard And Poor's, Fitch [Domain] Credit Rating, Standard And Poor's, Fitch [Domain] Credit Rating, Standard And Poor's, Fitch AAA Rated Standard & Poor's, Fitch, AAA Rating Member [Member] Standard & Poor's, Fitch, AAA Rating Member AA Rated Standard & Poor's, Fitch, AA Rating [Member] Standard & Poor's, Fitch, AA Rating [Member] A Rated Standard & Poor's, Fitch, A Rating [Member] Standard & Poor's, Fitch, A Rating [Member] BBB Rated Standard & Poor's, Fitch, BBB Rating [Member] Standard & Poor's, Fitch, BBB Rating [Member] Not Rated Not Rated [Member] Not rated. Marketable Securities Member Marketable Securities Member [Member] Marketable Securities Member [Member] Trading and Available for Sale Securities Trading and Available for Sale Securities [Member] Trading and Available for Sale Securities [Member] Concentration Risk Type [Axis] Portfolio Concentration Risk Member Portfolio Concentration Risk Member [Member] Portfolio Concentration Risk Member [Member] Credit Rating Concentration Risk Credit Rating Concentration Risk [Member] Credit Rating Concentration Risk [Member] External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Domain] External Credit Rating by Grouping [Domain] Investment Grade External Credit Rating, Investment Grade [Member] Non-Investment Grade External Credit Rating, Non Investment Grade [Member] Investments by Category [Axis] Investments by Category [Axis] Marketable Securities and Investments Held at Cost [Domain] Marketable Securities and Investments Held at Cost [Domain] Trading Securities and Available for Sale Securities Trading Securities and Available for Sale Securities [Member] Trading Securities and Available for Sale Securities [Member] Schedule of Trading Securities and Available-for-sale Securities [Line Items] Schedule of Trading Securities and Available-for-sale Securities [Line Items] [Line Items] for Schedule of Trading Securities and Available-for-sale Securities [Table] Amortized Cost Trading Securities and Available for Sale Securities, Debt Securities, Amortized Cost Trading Securities and Available for Sale Securities, Debt Securities, Amortized Cost Fair Value Trading Securities and Available for Sale Securities, Debt Securities Trading Securities and Available for Sale Securities, Debt Securities % of Total Investments Concentration Risk, Percentage Noncontrolling Interest [Abstract] NONCONTROLLING INTERESTS Noncontrolling Interest Disclosure [Text Block] GOODWILL, INTANGIBLE ASSETS AND DEFERRED CHARGE Goodwill, Intangible Assets, Intangible Assets Arising from Insurance Contracts Acquired in Business Combination, and Deferred Charges Disclosure [Text Block] Goodwill, Intangible Assets, Intangible Assets Arising from Insurance Contracts Acquired in Business Combination, and Deferred Charges Disclosure [Text Block] Schedule of Finite-Lived Intangible Assets [Table] Schedule of Finite-Lived Intangible Assets [Table] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Distribution channel Distribution Rights [Member] Technology Developed Technology Rights [Member] Brand Trade Dress [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Losses and LAE liabilities Reinsurance balances recoverable Other Assets Other Assets [Member] Other Liabilities Other Liabilities [Member] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Gross Carrying Value, Fair value adjustments Intangible Assets Arising From Insurance Contracts Acquired In Business Combination, Gross Intangible Assets Arising From Insurance Contracts Acquired In Business Combination, Gross Accumulated Amortization, Fair value adjustments Intangible Assets Arising From Insurance Contracts Acquired In Business Combination, Accumulated Amortization Intangible Assets Arising From Insurance Contracts Acquired In Business Combination, Accumulated Amortization Net Carrying Value, Fair value adjustments Intangible Assets Arising from Insurance Contracts Acquired in Business Combination Gross Carrying Value Finite-Lived Intangible Assets, Gross Accumulated Amortization Finite-Lived Intangible Assets, Accumulated Amortization Intangible assets with a definite life, Net Carrying Value Finite-Lived Intangible Assets, Net Schedule of Indefinite-Lived Intangible Assets [Table] Schedule of Indefinite-Lived Intangible Assets [Table] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets [Axis] Indefinite-lived Intangible Assets, Major Class Name [Domain] Indefinite-lived Intangible Assets, Major Class Name [Domain] Lloyd’s syndicate capacity Lloyd's Syndicate Capacity [Member] Lloyd's Syndicate Capacity [Member] Licenses Licensing Agreements [Member] Management contract Contract-Based Intangible Assets [Member] Indefinite-lived Intangible Assets [Line Items] Indefinite-lived Intangible Assets [Line Items] Intangible assets with an indefinite life, Carrying Value Indefinite-Lived Intangible Assets (Excluding Goodwill) Deferred charges on retroactive reinsurance, Gross Carrying Value Deferred Costs Current And Noncurrent, Gross Deferred Costs Current And Noncurrent, Gross Deferred charges on retroactive reinsurance, Accumulated Amortization Deferred Costs Current And Noncurrent, Accumulated Amortization Deferred Costs Current And Noncurrent, Accumulated Amortization Deferred charges on retroactive reinsurance, Net Carrying Value Deferred Costs SIGNIFICANT NEW BUSINESS Significant New Business [Text Block] Significant new business. REINSURANCE BALANCES RECOVERABLE Reinsurance [Text Block] Other than temporary impairment losses, available-for-sale securities Other than Temporary Impairment Losses, Investments, Available-for-sale Securities Schedule of Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table] Schedule of Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table] Debt Security Category [Axis] Debt Security Category [Axis] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Available-for-sale Securities Available-for-sale Securities [Member] Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] Credit losses Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held Liability for Claims and Claims Adjustment Expense [Table] Liability for Claims and Claims Adjustment Expense [Table] Liability for Claims and Claims Adjustment Expense [Line Items] Liability for Claims and Claims Adjustment Expense [Line Items] Prior Period Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense, Prior Years [Abstract] Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense, Prior Years [Abstract] Net losses paid, Prior Period Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Net change in case and LAE reserves, Prior Period Change in Case and Loss Adjustment Expense Reserve Period Increase (Decrease), Prior Years Change in Case and Loss Adjustment Expense Reserve Period Increase (Decrease), Prior Years Net change in IBNR reserves, Prior Period Liability For Unpaid Claims And Claims Adjustment Expense, Incurred But Not Reported Claims Amount, Period Increase (Decrease), Prior Years Liability For Unpaid Claims And Claims Adjustment Expense, Incurred But Not Reported Claims Amount, Period Increase (Decrease), Prior Years Amortization of deferred charges, Prior Period Deferred Costs, Current And Noncurrent, Amortization, Prior Year Deferred Costs, Current And Noncurrent, Amortization, Prior Year Increase (reduction) in estimates of net ultimate losses, Prior Period Net incurred losses and LAE, prior periods Current Period Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense, Current Year [Abstract] Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense, Current Year [Abstract] Net losses paid, Current Period Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Net change in case and LAE reserves, Current Period Change in Case and Loss Adjustment Expense Reserve Period Increase (Decrease), Current Year Change in Case and Loss Adjustment Expense Reserve Period Increase (Decrease), Current Year Net change in IBNR reserves, Current Period Liability For Unpaid Claims And Claims Adjustment Expense, Incurred But Not Reported Claims Amount, Period Increase (Decrease), Current Year Liability For Unpaid Claims And Claims Adjustment Expense, Incurred But Not Reported Claims Amount, Period Increase (Decrease), Current Year Amortization of deferred charges, Current Period Deferred Costs, Current And Noncurrent, Amortization, Current Year Deferred Costs, Current And Noncurrent, Amortization, Current Year Increase (reduction) in estimates of net ultimate losses, Current Period Estimates of Net Ultimate Losses, Period Increase (Decrease), Current Year Estimates of Net Ultimate Losses, Period Increase (Decrease), Current Year Increase (reduction) in provisions for bad debt, Current Period Provision For Doubtful Accounts, Current Year Provision For Doubtful Accounts, Current Year Increase (reduction) in provisions for unallocated loss adjustment expense liabilities, Current Period Provision For Unallocated Claim Adjustment Expense, Current Year Provision For Unallocated Claim Adjustment Expense, Current Year Amortization of fair value adjustments, Current Period Claims And Claims Adjustment Expense, Amortization Of Fair Value Adjustments, Current Year Claims And Claims Adjustment Expense, Amortization Of Fair Value Adjustments, Current Year Changes in fair value - fair value option, Current Period Claims And Claims Adjustment Expense, Change In Fair Value, Current Year Claims And Claims Adjustment Expense, Change In Fair Value, Current Year Net incurred losses and LAE, current period Total Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Abstract] Net losses paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Net change in case and LAE reserves Change in Case and Loss Adjustment Expense Reserve Period Increase (Decrease) Change in Case and Loss Adjustment Expense Reserve Period Increase (Decrease) Net change in IBNR reserves Liability For Unpaid Claims And Claims Adjustment Expense, Incurred But Not Reported Claims Amount, Period Increase (Decrease) Liability For Unpaid Claims And Claims Adjustment Expense, Incurred But Not Reported Claims Amount, Period Increase (Decrease) Amortization of deferred charges Increase (reduction) in estimates of net ultimate losses Estimates of Net Ultimate Losses, Period Increase (Decrease) Estimates of Net Ultimate Losses, Period Increase (Decrease) Increase (reduction) in provisions for bad debt Provision for Doubtful Accounts Increase (reduction) in provisions for unallocated LAE Provision For Unallocated Claim Adjustment Expense Provision For Unallocated Claim Adjustment Expense Amortization of fair value adjustments Claims And Claims Adjustment Expense, Amortization Of Fair Value Adjustments Claims And Claims Adjustment Expense, Amortization Of Fair Value Adjustments Changes in fair value - fair value option Claims And Claims Adjustment Expense, Change In Fair Value Claims And Claims Adjustment Expense, Change In Fair Value Total net incurred losses and LAE Total Losses and Loss Adjustment Expense Liabilities, and Reconciliation of Beginning and Ending Balances Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Schedule of Incurred Losses Schedule of Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] COMMITMENTS AND CONTINGENCIES Commitments and Contingencies Disclosure [Text Block] Call options on equities Equity Option [Member] Cost Derivative Asset, Notional Amount Unrealized gains in net earnings Derivative, Gain (Loss) on Derivative, Net Numerator: Net Income (Loss) Available to Common Stockholders, Diluted [Abstract] Net earnings from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Basic Share Net earnings from discontinued operations (in dollars per share) Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Net earnings per ordinary share (in dollars per share) Earnings Per Share, Basic Net earnings from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Net earnings from discontinued operations Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Weighted-average ordinary shares outstanding — basic (in shares) Weighted Average Number of Shares Outstanding, Basic Effect of dilutive securities: Dilutive Securities, Effect on Basic Earnings Per Share [Abstract] Share-based compensation plans (in shares) Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Warrants (in shares) Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Weighted-average ordinary shares outstanding — diluted (in shares) Weighted Average Number of Shares Outstanding, Diluted Basic: Earnings Per Share, Basic [Abstract] Diluted: Earnings Per Share, Diluted [Abstract] Net earnings from continuing operations (in dollars per share) Income (Loss) from Continuing Operations, Per Diluted Share Net earnings from discontinued operations (in dollars per share) Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share Net earnings per ordinary share (in dollars per share) Earnings Per Share, Diluted FUNDS HELD - DIRECTLY MANAGED Funds Held, Directly Managed [Text Block] Funds Held, Directly Managed [Text Block] Credit Rating, Standard And Poor's, Fitch [Axis] Trading Securities Trading Securities [Member] External Credit Rating by Grouping [Axis] Municipal Amortized Cost Carrying Value of Assets and Liabilities Underlying Funds Held - Directly Managed Funds Held, Directly Managed, Carrying Values of Assets [Table Text Block] Funds Held, Directly Managed, Carrying Values of Assets [Table Text Block] Contractual Maturities of Fixed Maturity Investments Underlying Funds Held - Directly Managed Funds Held, Directly Managed, Classified by Contractual Maturity Date [Table Text Block] Funds Held, Directly Managed, Classified by Contractual Maturity Date [Table Text Block] Funds Held - Directly Managed, by Credit Rating Schedule of Funds Held, Directly Managed, by Credit Rating [Table Text Block] Schedule of Funds Held, Directly Managed, by Credit Rating [Table Text Block] Net Realized and Unrealized Investment (Losses) Gains Funds Held, Directly Managed, Realized and Unrealized Gains and Losses [Table Text Block] Funds Held, Directly Managed, Realized and Unrealized Gains and Losses [Table Text Block] Net Investment Income Funds Held, Directly Managed, Investment Income [Table Text Block] Funds Held, Directly Managed, Investment Income [Table Text Block] Carrying Amount of Equity Attributable to Noncontrolling Interest Redeemable Noncontrolling Interest [Table Text Block] DERIVATIVE INSTRUMENTS Derivative Instruments and Hedging Activities Disclosure [Text Block] LOSSES AND LOSS ADJUSTMENT EXPENSES Life Settlements Life Settlements [Member] Life Settlements [Member] Other investments, at cost Other Investments and Securities, at Cost Amount of net investment income included in earnings attributable to investments in life settlements Impairment charges recognized in the period Other than Temporary Impairment Losses, Investments Number of Contracts Life Settlement Contracts, Investment Method, Number of Contracts, Rolling Maturity [Abstract] 0 – 1 year Life Settlement Contracts, Investment Method, Number of Contracts, Maturing in Next Rolling Twelve Months 1 – 2 years Life Settlement Contracts, Investment Method, Number of Contracts, Maturing in Rolling Year Two 2 – 3 years Life Settlement Contracts, Investment Method, Number of Contracts, Maturing in Rolling Year Three 3 – 4 years Life Settlement Contracts, Investment Method, Number of Contracts, Maturing in Rolling Year Four 4 – 5 years Life Settlement Contracts, Investment Method, Number of Contracts, Maturing in Rolling Year Five Thereafter Life Settlement Contracts, Investment Method, Number of Contracts, Maturing after Rolling Year Five Total Life Settlement Contracts, Investment Method, Number of Contracts Carrying Value Life Settlement Contracts, Investment Method, Carrying Amount, Rolling Maturity [Abstract] 0 – 1 year Life Settlement Contracts, Investment Method, Carrying Amount, Maturing in Next Rolling Twelve Months 1 – 2 years Life Settlement Contracts, Investment Method, Carrying Amount, Maturing in Rolling Year Two 2 – 3 years Life Settlement Contracts, Investment Method, Carrying Amount, Maturing in Rolling Year Three 3 – 4 years Life Settlement Contracts, Investment Method, Carrying Amount, Maturing in Rolling Year Four 4 – 5 years Life Settlement Contracts, Investment Method, Carrying Amount, Maturing in Rolling Year Five Thereafter Life Settlement Contracts, Investment Method, Carrying Amount, Maturing after Rolling Year Five Total Life Settlement Contracts, Investment Method, Carrying Amount Face Value (Death Benefits) Life Settlement Contracts, Investment Method, Face Value, Rolling Maturity [Abstract] 0 – 1 year Life Settlement Contracts, Investment Method, Face Value, Maturing in Next Rolling Twelve Months 1 – 2 years Life Settlement Contracts, Investment Method, Face Value, Maturing in Rolling Year Two 2 – 3 years Life Settlement Contracts, Investment Method, Face Value, Maturing in Rolling Year Three 3 – 4 years Life Settlement Contracts, Investment Method, Face Value, Maturing in Rolling Year Four 4 – 5 years Life Settlement Contracts, Investment Method, Face Value, Maturing in Rolling Year Five Thereafter Life Settlement Contracts, Investment Method, Face Value, Maturing after Rolling Year Five Total Life Settlement Contracts, Investment Method, Face Value Life Settlement Contracts, Investment Method, Premiums to be Paid, Fiscal Year Maturity [Abstract] Life Settlement Contracts, Investment Method, Premiums to be Paid, Fiscal Year Maturity [Abstract] Life insurance premiums payable, twelve months ending March 31, 2018 Life Settlement Contracts, Investment Method, Premiums to be Paid in Next Twelve Months Life insurance premiums payable, twelve months ending March 31, 2019 Life Settlement Contracts, Investment Method, Premiums to be Paid in Rolling Year Two Life insurance premiums payable, twelve months ending March 31, 2020 Life Settlement Contracts, Investment Method, Premiums to be Paid in Rolling Year Three Life insurance premiums payable, twelve months ending March 31, 2021 Life Settlement Contracts, Investment Method, Premiums to be Paid in Rolling Year Four Life insurance premiums payable, twelve months ending March 31, 2022 Life Settlement Contracts, Investment Method, Premiums to be Paid in Rolling Year Five Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Variable Rate [Axis] Variable Rate [Axis] Variable Rate [Domain] Variable Rate [Domain] Treasury Rate Treasury Rate [Member] Treasury Rate [Member] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Axis] Debt Instrument, Redemption, Period [Domain] Debt Instrument, Redemption, Period [Domain] Any time prior to one month prior to maturity Debt Instrument, Redemption, Period One [Member] On or after the date that is one month prior to maturity Debt Instrument, Redemption, Period Two [Member] Interest expense Interest Expense, Debt Facility term (years) Line of credit facility, remaining borrowing capacity Line of Credit Facility, Remaining Borrowing Capacity Receipt of loans Proceeds from Issuance of Long-term Debt Repayment of loans Repayments of Long-term Debt Derivative notional amount Currency translation adjustment - gain (loss) Number of financial institutions Debt Instrument, Number of Financial Institutions Debt Instrument, Number of Financial Institutions Percentage of consideration payable for acquisition Line of Credit Facility, Percentage of Consideration Payable Funded through Proceeds Line of Credit Facility, Percentage of Consideration Payable Funded through Proceeds Repayment of outstanding principal balance Repayments of Lines of Credit Aggregate principal amount Debt Instrument, Face Amount Stated interest rate Debt Instrument, Interest Rate, Stated Percentage Redemption price percentage Debt Instrument, Redemption Price, Percentage Redemption price, basis spread on variable rate Debt Instrument, Redemption Price, Discount Rate, Basis Spread On Variable Rate Debt Instrument, Redemption Price, Discount Rate, Basis Spread On Variable Rate Payments of debt issuance costs Payments of Debt Issuance Costs Gross Unrealized Gains Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax Gross Unrealized Losses Non-OTTI Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax Fair Value Equity [Abstract] Schedule of Stock by Class [Table] Schedule of Stock by Class [Table] Class of Stock [Line Items] Class of Stock [Line Items] Common shares issued upon conversion (in shares) Stock Issued During Period, Shares, Conversion of Convertible Securities Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table] Fixed Maturity Investments Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning fair value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Purchases and Assumed Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Net realized and unrealized gains Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Net transfers into (out of) Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net Net incurred losses and LAE Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances Paid losses Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Discounted cash flows Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Discounted Cash Flows Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Discounted Cash Flows Risk margin Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Risk Margin Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings, Risk Margin Effect of exchange rate movement Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Foreign Currency Translation Gain (Loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Foreign Currency Translation Gain (Loss) Ending fair value Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Beginning fair value Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value Assumed business Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Net incurred losses and LAE Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Issuances Paid losses Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Discounted cash flows Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings, Discounted Cash Flows Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings, Discounted Cash Flows Risk margin Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings, Risk Margin Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings, Risk Margin Effect of exchange rate movement Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Foreign Currency Translation Gain (Loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Foreign Currency Translation Gain (Loss) Ending fair value Fixed maturity investments Funds held Funds Held [Member] Funds Held [Member] Life settlements and other Life Settlements and Other [Member] Life Settlements and Other [Member] Noncontrolling Interest [Table] Noncontrolling Interest [Table] Dowling Dowling [Member] Dowling [Member] Subsidiaries Subsidiaries [Member] Noncontrolling Interest [Line Items] Noncontrolling Interest [Line Items] Interest owned by an entity (percent) Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Accounting Policies [Abstract] Basis of Preparation Basis of Accounting, Policy [Policy Text Block] Basis of Consolidation Consolidation, Policy [Policy Text Block] Reclassifications Reclassification, Policy [Policy Text Block] Use of Estimates Use of Estimates, Policy [Policy Text Block] Retroactive Reinsurance - Fair Value Option Reinsurance Accounting Policy [Policy Text Block] New Accounting Standards Adopted and Recently Issued Accounting Pronouncements Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Portion at Fair Value Measurement Portion at Fair Value Measurement [Member] Fair Value Estimate of Fair Value Measurement [Member] Carrying Value Reported Value Measurement [Member] Life Settlement Life Settlement Investment [Member] Life Settlement Investment Debt Security [Axis] Debt Security [Axis] Major Types of Debt Securities [Domain] Major Types of Debt Securities [Domain] Transfers between Levels 2 and 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Transfers between Levels 3 and 2 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Transfers from Levels 1 to 2, assets Fair Value, Assets, Level 1 to Level 2 Transfers, Amount Transfers from Levels 2 to 1, assets Fair Value, Assets, Level 2 to Level 1 Transfers, Amount Transfers between Levels 1 and 2, liabilities Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount Transfers from Levels 2 to 1, liabilities Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount Life settlements Other Investments Carried at Cost, Fair Value Disclosure Other Investments Carried at Cost, Fair Value Disclosure Debt, amortized cost Debt, fair value Debt Instrument, Fair Value Disclosure SHARE CAPITAL Stockholders' Equity Note Disclosure [Text Block] PREMIUMS WRITTEN AND EARNED Increase (Decrease) in Redeemable Noncontrolling Interest [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Balance at beginning of period Net earnings (loss) attributable to RNCI Net Income (Loss) Attributable to Redeemable Noncontrolling Interest Accumulated other comprehensive earnings (loss) attributable to RNCI Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Redeemable Noncontrolling Interest Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Redeemable Noncontrolling Interest Change in redemption value of RNCI Noncontrolling Interest, Change in Redemption Value Balance at end of period SEGMENT INFORMATION Segment Reporting Disclosure [Text Block] SIGNIFICANT ACCOUNTING POLICIES Significant Accounting Policies [Text Block] Allianz [Member] Allianz [Member] Allianz [Member] Funds held - directly managed, at cost, carrying value Funds Held under Reinsurance Agreements, Directly Managed, Carrying Value Funds Held under Reinsurance Agreements, Directly Managed, Carrying Value Funds held - directly managed, fair value of embedded derivative Funds Held under Reinsurance Agreements, Directly Managed, Fair Value of Embedded Derivative, Net Funds Held under Reinsurance Agreements, Directly Managed, Fair Value of Embedded Derivative, Net Funds held - directly managed Funds Held under Reinsurance Agreements, Directly Managed, Net Asset, at Carrying Value Funds Held under Reinsurance Agreements, Directly Managed, Net Asset, at Carrying Value Trading securities, amortized cost Trading securities, debt INVESTMENTS Investment [Text Block] Outstanding losses Liability for Unpaid Claims and Claims Adjustment Expense, Reported Claims, Amount IBNR Liability for Unpaid Claims and Claims Adjustment Expense, Incurred but Not Reported (IBNR) Claims, Amount Fair value adjustments Liability For Claims And Claims Adjustment Expense, Fair Value Adjustments, at Cost Liability For Claims And Claims Adjustment Expense, Fair Value Adjustments, at Cost Fair value adjustments - fair value option Liability For Claims And Claims Adjustment Expense, Fair Value Adjustments, at Fair Value Liability For Claims And Claims Adjustment Expense, Fair Value Adjustments, at Fair Value Total Liability for Claims and Claims Adjustment Expense Losses and loss adjustment expenses Liability for Claims and Claims Adjustment Expense, Cost Liability for Claims and Claims Adjustment Expense, Cost Losses and loss adjustment expenses, at fair value Reconciliation of Assets from Segment to Consolidated [Table] Reconciliation of Assets from Segment to Consolidated [Table] Segment Reporting, Asset Reconciling Item [Line Items] Segment Reporting, Asset Reconciling Item [Line Items] Total assets Assets EARNINGS PER SHARE Earnings Per Share [Text Block] Starstone Starstone [Member] Starstone [Member] Initial capital raise Proceeds from Issuance or Sale of Equity Ownership percentage Equity Method Investment, Ownership Percentage Warrant (in shares) Class of Warrant or Right, Number of Securities Called by Warrants or Rights Percentage of outstanding warrants Class of Warrant or Right, Number of Securities Called by Warrants or Rights, Percentage of Outstanding Warrants Class of Warrant or Right, Number of Securities Called by Warrants or Rights, Percentage of Outstanding Warrants Warrant, exercise price (in dollars per share) Class of Warrant or Right, Exercise Price of Warrants or Rights Carrying value of equity method investment Equity Method Investments Right to appoint members to Board of Directors, number of members Shareholders Agreement, Right To Appoint Members To Board of Directors, Number of Members Shareholders Agreement, Right To Appoint Members To Board of Directors, Number of Members Minimum number of common shares owned to appoint board members Shareholders Agreement, Minimum Number of Common Shares Owned For Right To Appoint Board Members Shareholders Agreement, Minimum Number of Common Shares Owned For Right To Appoint Board Members Lock-up period on common shares Shareholders Agreement, Lock-Up Period On Common Shares Shareholders Agreement, Lock-Up Period On Common Shares Percentage of business reinsured Percentage of Business Reinsured Percentage of Business Reinsured Ceded, premiums earned Unearned premiums, ceded Unearned Premiums, Ceded Unearned Premiums, Ceded Funds held under reinsurance agreements Funds Held under Reinsurance Agreements, Liability Insurance and reinsurance balances payable Reinsurance Payable Deferred policy acquisition costs, ceded Deferred Policy Acquisition Costs, Ceded Deferred Policy Acquisition Costs, Ceded Non-Life Run-off Segment, Atrium Segment, and Starstone Segment Non-Life Run-off Segment, Atrium Segment, and Starstone Segment [Member] Non-Life Run-off Segment, Atrium Segment, and Starstone Segment [Member] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Balance as at beginning of period Less: reinsurance reserves recoverable Less: deferred charges on retroactive insurance Net balance as at beginning of period Liability for Unpaid Claims and Claims Adjustment Expense, Net Net incurred losses and LAE: Liability for Unpaid Claims and Claims Adjustment Expense, Activity in Liability [Abstract] Current period Prior periods Net paid losses: Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid [Abstract] Current period Prior periods Net losses paid Effect of exchange rate movement Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) Acquired on purchase of subsidiaries Liability for Unpaid Claims and Claims Adjustment Expense, Business Acquisitions Net balance as at March 31 Plus: reinsurance reserves recoverable Plus: deferred charges on retroactive reinsurance Balance as at March 31 Effective tax rate Effective Income Tax Rate Reconciliation, Percent Statutory rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Unrecognized tax benefits Unrecognized Tax Benefits Income Statement [Abstract] Other income Net incurred losses and loss adjustment expenses Net foreign exchange losses NET EARNINGS Net earnings from discontinued operations (in dollars per share) Net earnings from discontinued operations (in dollars per share) Weighted-average ordinary shares outstanding — diluted (in shares) Non-U.S. government Corporate Commercial mortgage-backed Funds held - directly managed, other assets Funds held - directly managed, other assets Statement of Financial Position [Abstract] Short-term Investments Short-term Investments [Member] Short-term investments, available-for-sale, at fair value, amortized cost Ordinary shares, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Ordinary shares, authorized (in shares) Common Stock, Shares Authorized Ordinary shares issued (in shares) Common Stock, Shares, Issued Ordinary shares outstanding (in shares) Common Stock, Shares, Outstanding Treasury shares at cost (in shares) Treasury Stock, Shares Preferred shares issued (in shares) Preferred Stock, Shares Issued Preferred shares outstanding (in shares) Preferred Stock, Shares Outstanding DEBT OBLIGATIONS Debt Disclosure [Text Block] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Award Type [Axis] Equity Award [Domain] Equity Award [Domain] Restricted Stock And Stock Appreciation Rights SARS Restricted Stock And Stock Appreciation Rights SARS [Member] Restricted Stock And Stock Appreciation Rights SARS Employee Stock Employee Stock [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Compensation expense Allocated Share-based Compensation Expense Pension expense Pension Expense Mortgage-backed Securities, Issued by US Government Sponsored Enterprises Mortgage-backed Securities, Issued by US Government Sponsored Enterprises [Member] Senior Secured Debt Securities Senior Secured Debt Securities [Member] Senior Secured Debt Securities [Member] Portion at Fair Value Measurement Trading securities Trading Securities ASSETS Assets [Abstract] Trading, at fair value Available-for-sale, at fair value Available-for-sale Securities Total investments Investments Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Funds held - directly managed Premiums receivable Premiums Receivable, Net Deferred tax assets Deferred Income Tax Assets, Net Prepaid reinsurance premiums Prepaid Reinsurance Premiums Deferred acquisition costs Deferred Policy Acquisition Costs Goodwill and intangible assets Intangible Assets, Net (Including Goodwill) Other assets Other Assets Assets held for sale Disposal Group, Including Discontinued Operation, Assets TOTAL ASSETS LIABILITIES Liabilities [Abstract] Policy benefits for life and annuity contracts Liability for Future Policy Benefits Unearned premiums Unearned Premiums Deferred tax liabilities Deferred Income Tax Liabilities, Net Debt obligations Other liabilities Other Liabilities Liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities TOTAL LIABILITIES Liabilities COMMITMENTS AND CONTINGENCIES Commitments and Contingencies REDEEMABLE NONCONTROLLING INTEREST SHAREHOLDERS’ EQUITY Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Ordinary shares Common Stock, Value, Issued Series C Preferred Shares (issued and outstanding 2017: 388,571; 2016: 388,571) Preferred Stock, Value, Issued Treasury shares at cost (Preferred shares 2017: 388,571; 2016: 388,571) Treasury Stock, Value Additional paid-in capital Additional Paid in Capital Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Retained earnings Retained Earnings (Accumulated Deficit) Total Enstar Group Limited Shareholders’ Equity Stockholders' Equity Attributable to Parent TOTAL SHAREHOLDERS’ EQUITY TOTAL LIABILITIES, REDEEMABLE NONCONTROLLING INTEREST AND SHAREHOLDERS’ EQUITY Liabilities and Equity Financial Information of Held-For-Sale Business Disposal Groups, Including Discontinued Operations [Table Text Block] Statement of Cash Flows [Abstract] OPERATING ACTIVITIES: Net Cash Provided by (Used in) Operating Activities [Abstract] Net earnings Net (earnings) loss from discontinued operations Adjustments to reconcile net earnings to cash flows used in operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Net realized (gains) on sale of investments Marketable Securities, Realized Gain (Loss) Net unrealized (gains) on investments Unrealized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments Other non-cash items Other Noncash Income (Expense) Depreciation and other amortization Depreciation, Depletion and Amortization Net change in trading securities held on behalf of policyholders Net Change in Trading Securities Held on Behalf of Policyholders Net Change in Trading Securities Held on Behalf of Policyholders Sales and maturities of trading securities Proceeds from Sale of Securities, Operating Activities Purchases of trading securities Payments for Purchase of Securities, Operating Activities Changes in: Increase (Decrease) in Operating Capital [Abstract] Reinsurance balances recoverable Funds held by reinsured companies Increase (Decrease) in Funds Held under Reinsurance Agreements Losses and loss adjustment expenses Increase (Decrease) in Liability for Claims and Claims Adjustment Expense Reserve Policy benefits for life and annuity contracts Increase (Decrease) in Life Insurance Liabilities Insurance and reinsurance balances payable Increase (Decrease) in Reinsurance Payables Unearned premiums Increase (Decrease) in Unearned Premiums Other operating assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash flows used in operating activities Net Cash Provided by (Used in) Operating Activities INVESTING ACTIVITIES: Net Cash Provided by (Used in) Investing Activities [Abstract] Sales and maturities of available-for-sale securities Proceeds from Sale and Maturity of Available-for-sale Securities Purchase of available-for-sale securities Payments to Acquire Available-for-sale Securities Purchase of other investments Payments to Acquire Other Investments Redemption of other investments Proceeds from Sale and Maturity of Other Investments Other investing activities Payments for (Proceeds from) Other Investing Activities Net cash flows provided by investing activities Net Cash Provided by (Used in) Investing Activities FINANCING ACTIVITIES: Net Cash Provided by (Used in) Financing Activities [Abstract] Repayment of loans Net cash flows provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities EFFECT OF EXCHANGE RATE CHANGES ON FOREIGN CURRENCY CASH AND CASH EQUIVALENTS Effect of Exchange Rate on Cash and Cash Equivalents NET DECREASE IN CASH AND CASH EQUIVALENTS Cash, Cash Equivalents, Restricted Cash And Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, Cash Equivalents, Restricted Cash And Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD Cash, Cash Equivalents, Restricted Cash And Restricted Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents CASH AND CASH EQUIVALENTS, END OF PERIOD Supplemental Cash Flow Information: Supplemental Cash Flow Information [Abstract] Income taxes paid, net of refunds Income Taxes Paid, Net Interest paid Interest Paid Reconciliation to Consolidated Balance Sheets: Cash, Cash Equivalents, Restricted Cash And Restricted Cash Equivalents, Including Disposal Group And Discontinued Operations [Abstract] Cash, Cash Equivalents, Restricted Cash And Restricted Cash Equivalents, Including Disposal Group And Discontinued Operations [Abstract] Cash, cash equivalents and restricted cash Disposal Group, Including Discontinued Operation, Unclassified Balance Sheet Disclosures [Abstract] Disposal Group, Including Discontinued Operation, Unclassified Balance Sheet Disclosures [Abstract] Trading, at fair value Disposal Group, Including Discontinued Operation, Trading Securities, Debt Disposal Group, Including Discontinued Operation, Trading Securities, Debt Fixed maturities, held-to-maturity, at amortized cost Disposal Group, Including Discontinued Operation, Held-to-maturity Securities Disposal Group, Including Discontinued Operation, Held-to-maturity Securities Equities, trading, at fair value Disposal Group, Including Discontinued Operation, Trading Securities, Equity Disposal Group, Including Discontinued Operation, Trading Securities, Equity Other investments, at fair value Disposal Group, Including Discontinued Operation, Other Investments Disposal Group, Including Discontinued Operation, Other Investments Cash and cash equivalents Disposal Group, Including Discontinued Operation, Cash and Cash Equivalents Restricted cash and cash equivalents Disposal Group, Including Discontinued Operation, Restricted Cash and Cash Equivalents Disposal Group, Including Discontinued Operation, Restricted Cash and Cash Equivalents Deferred tax assets Disposal Group, Including Discontinued Operation, Deferred Tax Assets Reinsurance balances recoverable Disposal Group, Including Discontinued Operation, Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments Disposal Group, Including Discontinued Operation, Reinsurance Recoverable for Paid and Unpaid Claims and Claims Adjustments Other assets Disposal Group, Including Discontinued Operation, Other Assets Total assets held for sale Policy benefits for life and annuity contracts Disposal Group, Including Discontinued Operation, Liability for Future Policy Benefits Disposal Group, Including Discontinued Operation, Liability for Future Policy Benefits Other liabilities Disposal Group, Including Discontinued Operation, Other Liabilities Total liabilities held for sale Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract] INCOME Disposal Group, Including Discontinued Operation, Revenues [Abstract] Disposal Group, Including Discontinued Operation, Revenues [Abstract] Net premiums earned Disposal Group, Including Discontinued Operation, Premiums Earned, Net Disposal Group, Including Discontinued Operation, Premiums Earned, Net Net investment income Disposal Group, Including Discontinued Operation, Net Investment Income Disposal Group, Including Discontinued Operation, Net Investment Income Net realized and unrealized gains (losses) Disposal Group, Including Discontinued Operation, Gain (Loss) on Investments Disposal Group, Including Discontinued Operation, Gain (Loss) on Investments Other income Disposal Group, Including Discontinued Operation, Other Income Total income Disposal Group, Including Discontinued Operation, Revenue EXPENSES Disposal Group, Including Discontinued Operation, Expenses [Abstract] Disposal Group, Including Discontinued Operation, Expenses [Abstract] Life and annuity policy benefits Disposal Group, Including Discontinued Operation, Policyholder Benefits and Claims Incurred, Net, Life and Annuity Disposal Group, Including Discontinued Operation, Policyholder Benefits and Claims Incurred, Net, Life and Annuity Acquisition costs Disposal Group, Including Discontinued Operation, Business Combination, Acquisition Related Costs Disposal Group, Including Discontinued Operation, Business Combination, Acquisition Related Costs General and administrative expenses Disposal Group, Including Discontinued Operation, General and Administrative Expense Other expenses Disposal Group, Including Discontinued Operation, Other Expense Total expenses Disposal Group, Including Discontinued Operation, Benefits, Losses and Expenses Disposal Group, Including Discontinued Operation, Benefits, Losses and Expenses EARNINGS (LOSS) BEFORE INCOME TAXES Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax INCOME TAXES Discontinued Operation, Tax Effect of Discontinued Operation NET EARNINGS FROM DISCONTINUED OPERATIONS Net Cash Provided by (Used in) Discontinued Operations [Abstract] Net Cash Provided by (Used in) Discontinued Operations [Abstract] Operating activities Cash Provided by (Used in) Operating Activities, Discontinued Operations Investing activities Cash Provided by (Used in) Investing Activities, Discontinued Operations Change in cash of businesses held for sale Net Cash Provided by (Used in) Discontinued Operations RELATED PARTY TRANSACTIONS Related Party Transactions Disclosure [Text Block] Summary of Reinsurance Reserves Recoverable and Uncollectible Reinsurance Balances Recoverable Reinsurance Balances Recoverable by Reinsurer Ceded Credit Risk [Table Text Block] Intangible Assets Arising From Insurance Contracts Acquired In Business Combination, Accumulated Amortization Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill, Beginning balance Goodwill Goodwill, Acquired during the period Goodwill, Acquired During Period Goodwill, Ending balance Finite-lived Intangible Assets [Roll Forward] Finite-lived Intangible Assets [Roll Forward] Intangible assets with a definite life, Beginning balance Intangible assets with a definite life, Acquired during the period Finite-lived Intangible Assets Acquired Intangible assets with a definite life, Amortization Amortization of Intangible Assets Intangible assets with a definite life, Ending balance Indefinite-lived Intangible Assets [Roll Forward] Indefinite-lived Intangible Assets [Roll Forward] Intangible assets with an indefinite life, Beginning balance Intangible assets with an indefinite life, Acquired during the period Indefinite-lived Intangible Assets Acquired Intangible assets with an indefinite life, Ending balance Goodwill and Intangible Assets [Roll Forward] Goodwill and Intangible Assets [Roll Forward] Goodwill and Intangible Assets [Roll Forward] Goodwill and intangible assets, Beginning Balance Goodwill and intangible assets, Acquired during the period Goodwill And Intangible Assets Acquired During Period Goodwill And Intangible Assets Acquired During Period Intangible assets with a definite life, Amortization Goodwill and intangible assets, Ending balance Movement in Intangible Assets Arising from Insurance Contracts Acquired in Business Combination [Roll Forward] Movement in Intangible Assets Arising from Insurance Contracts Acquired in Business Combination [Roll Forward] Intangible assets with a definite life - FVA, Beginning balance Intangible assets with a definite life - FVA, Acquired during the period Intangible Assets Arising from Insurance Contracts Acquired in Business Combination, Additions Intangible assets with a definite life - FVA, Amortization Intangibles Assets Arising from Insurance Contracts Acquired in Business Combination, Amortization Expense Intangible assets with a definite life - FVA, Ending balance Deferred Charges [Roll Forward] Deferred Charges [Roll Forward] Deferred Charges [Roll Forward] Other assets - Deferred Charges, Acquired during the period Deferred Costs, Current And Noncurrent, Acquired Deferred Costs, Current And Noncurrent, Acquired Other assets - Deferred Charges, Amortization Ceded Credit Risk [Table] Ceded Credit Risk [Table] Top Ten Reinsurers Top Ten Reinsurers [Member] Top ten reinsurers. Other Reinsurers' Balances Greater Than $1 Million Other Reinsurers Balances Greater Than One Million Dollars [Member] Other reinsurers balances greater than one million dollars. Other Reinsurers' Balances Less Than $1 Million Other Reinsurers Balances Less Than One Million Dollars [Member] Other reinsurers balances less than one million dollars. Ceded Credit Risk [Line Items] Ceded Credit Risk [Line Items] % of Total