XML 79 R67.htm IDEA: XBRL DOCUMENT
v3.25.1

Investments - Equity Method Investments (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2017 | Mar. 31, 2021 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Equity method investments, opening balance |  |  | $ 7.6 | $ 6.2 |
Investment in the period |  |  | 0.0 | 0.4 | $ 2.0
Equity method investments, closing balance |  |  | 7.3 | 7.6 | 6.2
Equity Method Investments |  |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Unrealized (loss)/gain |  |  | (0.1) | 1.0 |
Realized (loss) for the twelve months to December 31, 2024 |  |  | (0.2) |  |
MVI |  |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Equity method investments, opening balance |  |  | 1.0 | 0.8 |
Investment in the period |  | $ 0.8 |  | 0.0 | 0.4
Equity method investments, closing balance |  |  | 0.8 | 1.0 | 0.8
MVI | Equity Method Investments |  |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Unrealized (loss)/gain |  |  | (0.2) | 0.2 |
Realized (loss) for the twelve months to December 31, 2024 |  |  | 0.0 |  |
Multi-Line Insurer |  |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Equity method investments, opening balance |  |  | 6.4 | 5.2 |
Investment in the period |  |  | 0.0 | 0.4 |
Equity method investments, closing balance |  |  | 6.5 | 6.4 | 5.2
Multi-Line Insurer | Equity Method Investments |  |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Unrealized (loss)/gain |  |  | 0.1 | 0.8 |
Realized (loss) for the twelve months to December 31, 2024 |  |  | 0.0 |  |
Digital Re |  |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Equity method investments, opening balance |  |  | 0.2 | 0.2 |
Investment in the period | $ 2.3 |  |  | 0.0 |
Equity method investments, closing balance |  |  | 0.0 | 0.2 | $ 0.2
Digital Re | Equity Method Investments |  |  |  |  |
Equity Method Investment, Aggregate Cost [Roll Forward] |  |  |  |  |
Unrealized (loss)/gain |  |  | 0.0 | $ 0.0 |
Realized (loss) for the twelve months to December 31, 2024 |  |  | $ (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 item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 270 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482964/270-10-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 32 -Subparagraph (ee) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-32 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481664/323-10-45-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481687/323-10-50-3 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 25 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482810/280-10-50-25 + Details
Name: | us-gaap_EquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-13 + Details
Name: | us-gaap_PaymentsToAcquireEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of realized gain (loss) on investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 + Details
Name: | us-gaap_RealizedInvestmentGainsLosses
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 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
Name: | us-gaap_UnrealizedGainLossOnInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByAssetClassAxis=us-gaap_EquityMethodInvestmentsMember
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_MultiLineReinsurerMember
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: |