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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Aggregate Liquidation Preference Shares | $ 1,000.0 | $ 775.0 |
Preferred Stock Issuance Cost | $ 29.5 |  | $ 21.5

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- Definition Aggregate liquidation preferences + References No definition available. + Details
Name: | ahl_AggregateLiquidationPreferenceShares
Namespace Prefix: | ahl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Preferred stock issuance cost + References No definition available. + Details
Name: | ahl_PreferredStockIssuanceCost
Namespace Prefix: | ahl_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration