XML 209 R144.htm IDEA: XBRL DOCUMENT v3.23.4

Credit Facilities and Short-Term Debt - Additional Information (Details) - USD ($)			12 Months Ended
	Dec. 01, 2021	Nov. 13, 2013	Dec. 31, 2022	Dec. 31, 2021	Feb. 07, 2023	Oct. 27, 2022	Jun. 17, 2022	Dec. 29, 2021	Nov. 30, 2021	Nov. 05, 2021	Apr. 01, 2021	Nov. 30, 2020	Nov. 03, 2020	Feb. 11, 2019
Line of Credit Facility [Line Items]
Revolving credit facility, credit agreement maximum limit	$ 300,000,000
Line of credit facility Increasable capacity	$ 100,000,000
Minimum consolidated tangible net worth under credit facility			$ 2,019,600,000
Percentage of consolidated net income			25.00%
Percentage of aggregate net cash proceeds from the issuance of capital stock			25.00%
Percentage of consolidated leverage ratio permitted			35.00%
Securities lending transaction			$ 50,000,000
Maximum
Line of Credit Facility [Line Items]
Securities lending transaction							$ 50,000,000
Aspen U.K. | Deutsche
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Amount			22,800,000
Aspen U.K. | Citibank Europe
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Amount			75,100,000
AUL | Lloyd's
Line of Credit Facility [Line Items]
Letter of Credit to Support Funds at Lloyd's						$ 285,000,000
Funds at Lloyd's Facility Agreement									$ 80,000,000			$ 150,000,000
AUL | Lloyd's | Maximum
Line of Credit Facility [Line Items]
Letter of Credit to Support Funds at Lloyd's													$ 235,000,000
Bermuda | Natixis
Line of Credit Facility [Line Items]
Revolving credit facility, credit agreement maximum limit										$ 100,000,000
Bermuda | HSBC Bank USA, National Association
Line of Credit Facility [Line Items]
Revolving credit facility, credit agreement maximum limit								$ 75,000,000
Aspen Specialty | Federal Home Loan Bank of Boston
Line of Credit Facility [Line Items]
Revolving credit facility, credit agreement maximum limit											$ 223,000,000
Percentage limit of pledged assets permitted to secure debt obligations											15.00%
AAIC | Federal Home Loan Bank of Boston
Line of Credit Facility [Line Items]
Revolving credit facility, credit agreement maximum limit											$ 141,000,000
Percentage limit of pledged assets permitted to secure debt obligations											10.00%
Citibank Europe
Line of Credit Facility [Line Items]
Outstanding collateralized letters of credit facility			416,800,000	$ 452,400,000
Letters of credit / guarantees | Aspen U.K. | Aspen European
Line of Credit Facility [Line Items]
Revolving credit facility, credit agreement maximum limit														$ 100,000,000
Letters of credit / guarantees | Aspen U.K. | Aspen European | Subsequent Event
Line of Credit Facility [Line Items]
Revolving credit facility, credit agreement maximum limit					$ 100,000,000
Standby Letters of Credit | Bermuda
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Amount			100,000,000
Standby Letters of Credit | Bermuda | Deutsche
Line of Credit Facility [Line Items]
Line of Credit Facility, Commitment Fee Amount			120,000,000
Citibank Europe plc | Letters of credit / guarantees
Line of Credit Facility [Line Items]
Revolving credit facility, credit agreement maximum limit			400,000,000
Senior Notes
Line of Credit Facility [Line Items]
Loans issued		$ 300,000,000
Debt stated interest rate		4.65%
Net proceeds from senior notes		$ 299,700,000
Amount of indebtedness subject to default in payment			50,000,000
Annual interest payable			$ 14,300,000

X

- Definition

Debt default minimum.

+ References

No definition available.

+ Details

Name:	ahl_DebtDefaultMinimum
Namespace Prefix:	ahl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Funds at Lloyd's Facility Agreement

+ References

No definition available.

+ Details

Name:	ahl_FundsAtLloydsFacilityAgreement
Namespace Prefix:	ahl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Letter of Credit to Support Funds at Lloyd's

+ References

No definition available.

+ Details

Name:	ahl_LetterOfCreditToSupportFundsAtLloyds
Namespace Prefix:	ahl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line of credit facility Increasable capacity.

+ References

No definition available.

+ Details

Name:	ahl_LineOfCreditFacilityIncreasableCapacity
Namespace Prefix:	ahl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Line of credit facility increase additional borrowing capacity.

+ References

No definition available.

+ Details

Name:	ahl_LineOfCreditFacilityIncreaseAdditionalBorrowingCapacity
Namespace Prefix:	ahl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line of credit facility tangible net worth cash proceeds from the issuance of capital stock restriction.

+ References

No definition available.

+ Details

Name:	ahl_LineOfCreditFacilityTangibleNetWorthCashProceedsFromIssuanceOfCapitalStockRestriction
Namespace Prefix:	ahl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line of credit facility tangible net worth net income restriction.

+ References

No definition available.

+ Details

Name:	ahl_LineOfCreditFacilityTangibleNetWorthNetIncomeRestriction
Namespace Prefix:	ahl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line of credit facility tangible net worth restrictions minimum.

+ References

No definition available.

+ Details

Name:	ahl_LineOfCreditFacilityTangibleNetWorthRestrictionsMinimum
Namespace Prefix:	ahl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Percentage limit of reserve assets permitted to secure debt obligations

+ References

No definition available.

+ Details

Name:	ahl_PercentageLimitOfReserveAssetsPermittedToSecureDebtObligations
Namespace Prefix:	ahl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Percentage of consolidated leverage ratio permitted.

+ References

No definition available.

+ Details

Name:	ahl_PercentageOfConsolidatedLeverageRatioPermitted
Namespace Prefix:	ahl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Securities lending transaction to support funds at Lloyd's

+ References

No definition available.

+ Details

Name:	ahl_SecuritiesLendingTransactionToSupportFundsAtLloyds
Namespace Prefix:	ahl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI https://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI https://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629

Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI https://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Amount of the fee for available but unused credit capacity under the credit facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeeAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of the required periodic payment applied to interest.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityPeriodicPaymentInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3255-108585

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=ahl_AspenUKMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=ahl_DeutscheMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=ahl_CitibankEuropeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=ahl_AspenUnderwritingLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=ahl_LloydsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=ahl_AspenBermudaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=ahl_NatixisMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=ahl_HSBCBankUSANationalAssociationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=ahl_AspenSpecialtyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_FederalHomeLoanBankAdvancesBranchOfFHLBBankAxis=srt_FederalHomeLoanBankOfBostonMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=ahl_AAICMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=ahl_CitibankEuropeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=ahl_AspenEuropeanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_StandbyLettersOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=ahl_CitibankEuropeplcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_LineOfCreditFacilityAxis=us-gaap_SeniorNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: