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: