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Statutory Requirements and Dividends Restrictions - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Statutory Accounting Practices [Line Items]
Capital contributions reserves	$ 879.9
Aspen UK
Statutory Accounting Practices [Line Items]
Dividend payment made without regulatory approval	(690.0)
AUL
Statutory Accounting Practices [Line Items]
Dividend payment made without regulatory approval	(31.0)
Syndicate to maintain funds at Lloyd	964.6
Total funds held by AUL	1,016.7
Bermuda
Statutory Accounting Practices [Line Items]
Dividend payment made without regulatory approval	$ (322.9)
Statutory capital and surplus, percent	25.00%
Statutory capital and surplus, percent reduction requiring approval	15.00%
Percent warning level of amount of enhanced capital required from statutory capital and surplus	120.00%
Bermuda | AUL
Statutory Accounting Practices [Line Items]
Total funds held by AUL	$ 465.2

X

- Definition

Capital Reserves

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- Definition

Dividend Payments Restrictions Schedule, Statutory Capital and Surplus, Percent

+ References

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- Definition

Funds maintained at syndicate

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- Definition

Percent Warning Level of Amount of Enhanced Capital Required from Statutory Capital and Surplus

+ References

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- Definition

Statutory Capital and Surplus, Percent Requiring Approval

+ References

No definition available.

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- Definition

Carrying amount as of the balance sheet date of the funds held on behalf of others and that are expected to be liquidated within one year or the normal operating cycle, if longer. This does not include funds held under reinsurance agreements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(8))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(23)(c))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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- Definition

Amount of dividends that can be declared or paid without approval of regulatory agency.

+ References

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