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Fair Value Measurements - Other Financial Assets and Liabilities Not Carried at Fair Value (Details) - Level 2 - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes	$ 747.7	$ 1,097.4
Junior subordinated notes	1,216.1	1,216.0
Junior convertible securities	341.7	341.7
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions
Senior notes	740.9	1,062.9
Junior subordinated notes	1,031.2	1,035.6
Junior convertible securities	$ 437.4	$ 372.2

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