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Debt - Credit Facility (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($)
Revolving Credit Facility
Line of Credit Facility [Line Items]
Borrowing capacity	$ 1,250
Maximum borrowing capacity	$ 1,750
Capitalization ratio	35.00%
Line of Credit Facility, Covenant Terms, Consolidated Net Worth Requirement, Amount	$ 7,300
Liquidity Facility
Line of Credit Facility [Line Items]
Borrowing capacity	2,500
Maximum borrowing capacity	3,000
Liquidity Facility | ALRe
Line of Credit Facility [Line Items]
Line of Credit Facility, Covenant Terms, Consolidated Net Worth Requirement, Amount	$ 9,300

X

- Definition

Line of Credit Facility, Covenant Terms, Consolidated Net Worth Requirement, Amount

+ References

No definition available.

+ Details

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Namespace Prefix:	ahl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Line of Credit Facility, Covenant Terms, Maximum Consolidated Debt to Capitalization Ratio

+ References

No definition available.

+ Details

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Namespace Prefix:	ahl_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

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

X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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 210.5-02.19(b),22(b))
-URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant

X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

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- Details

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