Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedAmortizedCost
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Fair value of short-term and fixed maturity investments, classified as trading and AFS, and the fixed maturity investments included in funds held - directly managed, maturing in more than ten years.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Percent of total fair value of short-term and fixed maturity investments, classified as trading and AFS, and the fixed maturity investments included in funds held - directly managed, maturing in more than ten years.

No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedDebtMaturitiesAfterTenYearsFairValuePercent
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Amortized cost of short-term and fixed maturity investments, classified as trading and AFS, and the fixed maturity investments included in funds held - directly managed, maturing in more than ten years.

No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedDebtMaturitiesFiscalMaturityAfterTenYearsAmortizedCost
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No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedDebtMaturitiesFiscalYearOneThroughFiveAmortizedCost
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Fair value of short-term and fixed maturity investments, classified as trading and AFS, and the fixed maturity investments included in funds held - directly managed, maturing in more than one year through five years.

No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedDebtMaturitiesFiscalYearOneThroughFiveFairValue
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Data Type:	xbrli:monetaryItemType
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No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedDebtMaturitiesFiscalYearOneThroughFiveFairValuePercent
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No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedDebtMaturitiesFiscalYearSixThroughTenAmortizedCost
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Data Type:	xbrli:monetaryItemType
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No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedDebtMaturitiesFiscalYearSixThroughTenFairValue
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Data Type:	xbrli:monetaryItemType
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No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedDebtMaturitiesFiscalYearSixThroughTenFairValuePercent
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Amortized cost of short-term and fixed maturity investments, classified as trading and AFS, and the fixed maturity investments included in funds held - directly managed, maturing within one year.

No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedDebtMaturitiesNextTwelveMonthsAmortizedCost
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Data Type:	xbrli:monetaryItemType
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Fair value of short-term and fixed maturity investments, classified as trading and AFS, and the fixed maturity investments included in funds held - directly managed, maturing within one year.

No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedDebtMaturitiesNextTwelveMonthsFairValue
Namespace Prefix:	esgr_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedDebtMaturitiesNextTwelveMonthsFairValuePercent
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Data Type:	dtr-types:percentItemType
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Amortized cost of short-term and fixed maturity investments, classified as trading and AFS, and the fixed maturity investments included in funds held - directly managed, without a single maturity date.

No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedDebtMaturitiesWithoutSingleMaturityDateAmortizedCostBasis
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Data Type:	xbrli:monetaryItemType
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Fair value of short-term and fixed maturity investments, classified as trading and AFS, and the fixed maturity investments included in funds held - directly managed, without a single maturity date.

No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedDebtMaturitiesWithoutSingleMaturityDateFairValue
Namespace Prefix:	esgr_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedDebtMaturitiesWithoutSingleMaturityDateFairValuePercent
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Data Type:	dtr-types:percentItemType
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Percent of total fair value of short-term and fixed maturity investments, classified as trading and AFS, and the fixed maturity investments included in funds held - directly managed.

No definition available.

Name:	esgr_DebtSecuritiesAvailableForSaleTradingSecuritiesAndFundsHeldDirectlyManagedPercentageOfFairValue
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Data Type:	dtr-types:percentItemType
Balance Type:	na
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Trading Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract]

No definition available.

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Trading Securities, Debt Maturities, Fair Value, Rolling Maturity [Abstract]

No definition available.

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Trading Securities, Debt Maturities, Percent of Total Fair Value, Rolling Maturity [Abstract]

No definition available.

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Data Type:	xbrli:stringItemType
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Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480078/944-80-55-14

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 80
-Name Accounting Standards Codification
-Section 55
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480078/944-80-55-9

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(a))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481830/320-10-45-1

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(1)(6))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1