XML 190 R113.htm IDEA: XBRL DOCUMENT v3.22.1

Concentration of Credit Risk - Schedule Of Gross Written Premium From Major Brokers (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Investment Holdings [Line Items]
Gross written premiums, percentage	100.00%	100.00%	100.00%
Gross written premiums	$ 3,938.4	$ 3,698.5	$ 3,442.4
Aon Corporation
Investment Holdings [Line Items]
Gross written premiums, percentage	17.30%	15.80%	13.40%
Marsh & McLennan Companies, Inc.
Investment Holdings [Line Items]
Gross written premiums, percentage	17.50%	15.40%	13.60%
Willis Group Holdings, Ltd.
Investment Holdings [Line Items]
Gross written premiums, percentage	9.60%	10.40%	10.30%
Others
Investment Holdings [Line Items]
Gross written premiums, percentage	55.60%	58.40%	62.70%

X

- Definition

Premiums written gross percentage.

+ References

No definition available.

+ Details

Name:	ahl_PremiumsWrittenGrossPercentage
Namespace Prefix:	ahl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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_InvestmentHoldingsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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 http://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

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ahl_AonCorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ahl_MarshAndMcLennanCompaniesIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ahl_WillisGroupHoldingsLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=ahl_OthersMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: