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Credit Facilities and Long-Term Debt - Additional Information (Details) - USD ($)		12 Months Ended
	Dec. 01, 2021	Dec. 31, 2024	Dec. 31, 2023	Oct. 31, 2024	Oct. 24, 2023	Jul. 26, 2023	Feb. 07, 2023	Dec. 29, 2021	Nov. 05, 2021	Apr. 01, 2021	Nov. 03, 2020	Feb. 11, 2019
Line of Credit Facility [Line Items]
Credit facilities, unutilized capacity		$ 774,000,000
Revolving credit facility, credit agreement maximum limit	$ 300,000,000.0
Line of credit facility Increasable capacity	$ 100,000,000.0
Minimum consolidated tangible net worth under credit facility		$ 2,019,600,000
Percentage of consolidated net income		25.00%
Percentage of aggregate net cash proceeds from the issuance of capital stock		25.00%
Percentage of consolidated leverage ratio permitted		35.00%
AUL | Lloyd's
Line of Credit Facility [Line Items]
Letter of Credit to Support Funds at Lloyd's					$ 430,000,000.0
Funds at Lloyd's Facility Agreement				$ 25,000,000.0
Funds at Lloyd's Amended Facility Agreement				$ 60,000,000.0
AUL | Lloyd's | Maximum
Line of Credit Facility [Line Items]
Letter of Credit to Support Funds at Lloyd's											$ 235,000,000.0
Bermuda | Natixis
Line of Credit Facility [Line Items]
Revolving credit facility, credit agreement maximum limit									$ 100,000,000.0
Bermuda | HSBC Bank USA, National Association
Line of Credit Facility [Line Items]
Revolving credit facility, credit agreement maximum limit								$ 75,000,000.0
Aspen Specialty | Federal Home Loan Bank of Boston
Line of Credit Facility [Line Items]
Revolving credit facility, credit agreement maximum limit										$ 262,000,000
Percentage limit of pledged assets permitted to secure debt obligations										15.00%
AAIC | Federal Home Loan Bank of Boston
Line of Credit Facility [Line Items]
Revolving credit facility, credit agreement maximum limit										$ 212,000,000
Percentage limit of pledged assets permitted to secure debt obligations										10.00%
Letters of credit / guarantees | Aspen UK | Aspen European
Line of Credit Facility [Line Items]
Revolving credit facility, credit agreement maximum limit							$ 100,000,000					$ 100,000,000
Secured and unsecured financing facilities
Line of Credit Facility [Line Items]
Long-term line of credit		$ 1,700,000,000
2026 Term Loan
Line of Credit Facility [Line Items]
Loans issued						$ 300,000,000.0
Interest Expense		$ 20,500,000	$ 3,000,000.0

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Line of credit facility tangible net worth net income restriction

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Line of credit facility tangible net worth restrictions minimum

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Percentage limit of reserve assets permitted to secure debt obligations

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Face (par) amount of debt instrument at time of issuance.

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Amount of interest expense classified as operating and nonoperating. Includes, but is not limited to, cost of borrowing accounted for as interest expense.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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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.

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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.

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