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Subsequent Events - Narrative (Details) - USD ($)	Apr. 01, 2021	Mar. 27, 2017
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity		$ 200,000,000
Subsequent Event | Aspen Specialty | Federal Home Loan Bank of Boston
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	$ 98,000,000
Subsequent Event | AAIC | Federal Home Loan Bank of Boston
Subsequent Event [Line Items]
Line of credit facility, maximum borrowing capacity	$ 97,000,000
Percentage limit of pledged assets permitted to secure debt obligations	10.00%

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:	num:percentItemType
Balance Type:	na
Period Type:	instant

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 http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

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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: