XML 164 R87.htm IDEA: XBRL DOCUMENT
v3.22.1

Reserves for Losses and Adjustment Expenses - Reconciliation of Reinsurance Recoverables on Unpaid Losses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Insurance [Abstract] |  |  |
Adverse development cover reinsurance agreement cover | $ 0.0 | $ (818.5) | $ 0.0
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Reinsurance recoverables on unpaid losses, start of period | 3,195.2 | 2,319.8 |
Reinsurance recoverables on unpaid losses, end of period | 3,298.1 | 3,195.2 | 2,319.8
Deferred Gain on Reinsurance | (58.3) | 0.0 | 0.0
ADC |  |  |
SEC Schedule, 12-17, Insurance Companies, Reinsurance [Line Items] |  |  |
Reinsurance recoverables on unpaid losses, start of period | 2,518.3 | 2,425.2 | 2,319.8
Reinsurance recoverables on unpaid losses, end of period |  | 2,518.3 | 2,425.2
Reinsurance recoverables, premium paid and recognized | 68.1 | 0.0 | 0.0
Enstar |  |  |
Insurance [Abstract] |  |  |
Adverse development cover reinsurance agreement cover | $ 770.0 | $ 770.0 | $ 0.0

X
- Definition Deferred Gain on Retroactive Reinsurance + References No definition available. + Details
Name: | ahl_DeferredGainOnReinsurance
Namespace Prefix: | ahl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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

X
- Definition Reinsurance recoverables, including premium paid and recognized + References No definition available. + Details
Name: | ahl_ReinsuranceRecoverablesIncludingPremiumPaidAndRecognized
Namespace Prefix: | ahl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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: | srt_ReinsurancePremiumsForInsuranceCompaniesByProductSegmentLineItems
Namespace Prefix: | srt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_InsuranceAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after valuation allowance, recoverable under reinsurance contracts including premium paid under reinsurance contracts. Examples include, but are not limited to, settled and unsettled claims, incurred but not reported losses, loss adjustment expense, premium paid, policy benefits and policy reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(6)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99397103&loc=d3e6824-158387 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 310 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=99404803&loc=d3e21409-158489 + Details
Name: | us-gaap_ReinsuranceRecoverables
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Details
Name: | srt_CounterpartyNameAxis=ahl_EnstarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |