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v3.22.1

Subsequent Events - Narrative (Details) $ in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
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 |  |  |  |

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- Definition Annual rate of interest + References No definition available. + Details
Name: | ahl_AnnualRateOfInterest
Namespace Prefix: | ahl_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

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- 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

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- 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

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- 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

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- Definition Amount of risk reinsured in excess of stated retention per company policy. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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

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

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