Investments - Investment in Fortitude (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2026	Dec. 31, 2025
Schedule of Equity Method Investments [Line Items]
Investment	$ 2,982.3	$ 2,879.5
Carlyle FRL
Schedule of Equity Method Investments [Line Items]
Investment	729.2
Investment, cost	$ 666.8
Carlyle FRL \| Fortitude Group Holdings, LLC
Schedule of Equity Method Investments [Line Items]
Ownership percentage	10.50%
Fortitude Group Holdings, LLC \| Fortitude Re
Schedule of Equity Method Investments [Line Items]
Committed capital	$ 25,200.0
Fortitude Group Holdings, LLC \| Carlyle FRL
Schedule of Equity Method Investments [Line Items]
Ownership percentage acquired	38.50%
Fortitude Group Holdings, LLC \| Carlyle FRL, L.P. and Other Third-Party Investors
Schedule of Equity Method Investments [Line Items]
Ownership percentage acquired	97.50%

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