XML 75 R59.htm IDEA: XBRL DOCUMENT
v3.23.1

Segment Reporting - Summary of the Schedule of the Company's gross written premiums based on the location of the insured risk (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | $ 4,338.7 | $ 3,938.4 | $ 3,698.5
Australia/Asia |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | 257.5 | 275.8 | 259.7
Europe |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | 194.5 | 140.6 | 92.5
United Kingdom |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | 485.8 | 393.2 | 369.0
United States & Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | 2,715.7 | 2,301.8 | 2,267.5
Worldwide excluding United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | 24.2 | 31.5 | 23.1
Worldwide including United States |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | 541.7 | 592.2 | 501.2
Other (4) |  |  |
Segment Reporting Information [Line Items] |  |  |
Gross written premiums | $ 119.3 | $ 203.3 | $ 185.5

X
- Definition Amount of direct and assumed premiums written. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
Name: | us-gaap_PremiumsWrittenGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_StatementGeographicalAxis=srt_AsiaPacificMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=srt_EuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ahl_UnitedStatesAndCanadaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=us-gaap_NonUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ahl_WorldwideIncludingUnitedStatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ahl_OtherCountriesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |