Annual rate of interest

No definition available.

Name:	ahl_AnnualRateOfInterest
Namespace Prefix:	ahl_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

- Definition

Liability for unpaid claims and claims adjustment expense amount disposed of.

+ References

No definition available.

+ Details

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

- Definition

Reinsurance Recoverables for Unpaid Claims and Claims Adjustments, Ceded Cumulative Losses

+ References

No definition available.

+ Details

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

- Definition

Stated amount that is the upper retention limit per entity policy.

+ References

No definition available.

+ Details

Name:	us-gaap_ReinsuranceRetentionPolicyAmountRetained
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of risk reinsured in excess of stated retention per company policy.

+ References

No definition available.

+ Details

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

- 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

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

- Details

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

- Details

Name:	us-gaap_ReinsurancePolicyTypeAxis=ahl_LPTMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events - Narrative (Details) $ in Millions			12 Months Ended
Subsequent Events - Narrative (Details) $ in Millions	Oct. 01, 2022	Jan. 10, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Subsequent Event [Line Items]
Adverse development cover reinsurance agreement cover			$ 0.0	$ (818.5)	$ 0.0
Subsequent Event \| LPT
Subsequent Event [Line Items]
Reinsurance Retention Policy, Excess Retention, Amount Reinsured		$ 3,120.0
Reinsurance retention policy, amount retained		3,570.0
Reinsurance Recoverables for Unpaid Claims and Claims Adjustment, Ceded Claims Gross		$ 3,160.0
Annual rate of interest	0.0175