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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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