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Fair Value Measurements - Other Financial Liabilities Not Carried at Fair Value (Details) - Level 2 - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Senior notes | $ 1,099.4 | $ 1,098.7
Junior subordinated notes | 765.9 | 765.9
Junior convertible securities | 341.7 | 341.7
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Senior notes | 1,049.8 | 1,024.6
Junior subordinated notes | 612.0 | 552.3
Junior convertible securities | $ 340.9 | $ 346.9

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