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Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	Jan. 01, 2017	Oct. 31, 2016	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2010
Blue Waters
Finite-Lived Intangible Assets [Line Items]
Goodwill, acquired		$ 2.1
Trademarks
Finite-Lived Intangible Assets [Line Items]
Value of the asset			$ 1.2	$ 1.3	$ 1.6
Aspen trademark
Finite-Lived Intangible Assets [Line Items]
Value of the asset			1.2
Insurance Licenses
Finite-Lived Intangible Assets [Line Items]
Value of the asset			16.7	$ 16.7	$ 16.7	$ 10.0
Insurance Licenses | Aspen Specialty
Finite-Lived Intangible Assets [Line Items]
Value of the asset			4.5
Insurance Licenses | Aspen U.K.
Finite-Lived Intangible Assets [Line Items]
Value of the asset			$ 2.1
Digital Re
Finite-Lived Intangible Assets [Line Items]
Goodwill, acquired	$ 1.8
Equity method investment, ownership percentage	49.00%

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- Definition

Finite And Indefinite Lived Intangible Assets By Major Class [Line Items]

+ References

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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