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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, 2024 | Dec. 31, 2023
--- | --- | ---
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | $ 1,097.3 | $ 1,099.4
Junior subordinated notes | 1,216.0 | 765.9
Junior convertible securities | 341.7 | 341.7
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | 1,075.8 | 1,049.8
Junior subordinated notes | 1,129.6 | 612.0
Junior convertible securities | $ 375.9 | $ 340.9

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