XML 227 R162.htm IDEA: XBRL DOCUMENT
v3.23.4

Investments - Other Investments (Details) - USD ($) $ in Millions | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 | Jun. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Opening undistributed value of investment, beginning balance |  | $ 6.2 | $ 3.9 | $ 0.9
Investment in the period |  | 0.4 | 2.0 | 3.2
Closing value of investment, ending balance |  | 7.0 | 6.2 | 3.9
Equity Method Investment, Nonconsolidated Investee, Other |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Unrealized Gain (Loss) on Investments |  | 0.4 | 0.3 | 0.3
Fair Value, Recurring [Member] | Real estate fund (Dec 2017) |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Investments, fair value |  | 125.2 | 134.6 | 129.9
MVI |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Opening undistributed value of investment, beginning balance |  | 0.8 | 0.5 | 0.0
Investment in the period | $ 0.8 | 0.0 | 0.4 | 0.4
Closing value of investment, ending balance |  | 0.8 | 0.8 | 0.5
MVI | Equity Method Investment, Nonconsolidated Investee, Other |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Unrealized Gain (Loss) on Investments |  | 0.0 | (0.1) | 0.1
Digital Re |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Opening undistributed value of investment, beginning balance |  | 0.2 | 0.2 | 0.4
Investment in the period |  | 0.0 | 0.0 | 0.3
Closing value of investment, ending balance |  | 0.2 | 0.2 | 0.2
Digital Re | Equity Method Investment, Nonconsolidated Investee, Other |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Unrealized Gain (Loss) on Investments |  | 0.0 | 0.0 | 0.0
Multi-Line Insurer |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Opening undistributed value of investment, beginning balance |  | 5.2 | 3.2 | 0.5
Investment in the period |  | 0.4 | 1.6 | 2.5
Closing value of investment, ending balance |  | 6.0 | 5.2 | 3.2
Multi-Line Insurer | Equity Method Investment, Nonconsolidated Investee, Other |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |
Unrealized Gain (Loss) on Investments |  | $ 0.4 | $ 0.4 | $ 0.2

X
- Definition Equity Method Investment, Aggregate Cost [Roll Forward] + References No definition available. + Details
Name: | ahl_EquityMethodInvestmentAggregateCostRollForward
Namespace Prefix: | ahl_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition This element represents the aggregate cost of investments accounted for under the equity method of accounting. + 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 210.5-02.12) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_EquityMethodInvestmentAggregateCost
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126976982&loc=d3e19207-110258 + Details
Name: | us-gaap_InvestmentsFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The net cash outflow or inflow associated with the acquisition or sale of a business segment during the period. + References No definition available. + Details
Name: | us-gaap_PaymentsForProceedsFromBusinessesAndInterestInAffiliates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of unrealized gain (loss) on investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
Name: | us-gaap_UnrealizedGainLossOnInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeAxis=us-gaap_EquityMethodInvestmentNonconsolidatedInvesteeOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=ahl_RealEstateFundDec2017Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ahl_MVIMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ahl_DigitalRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=ahl_MultiLineReinsurerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |