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Fair Value Measurements - Other Financial Assets and Liabilities Not Carried at Fair Value (Details) - Level 2 - USD ($) $ in Millions | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | $ 1,099.0 | $ 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 |  |
Senior notes | 1,019.9 | 1,024.6
Junior subordinated notes | 594.6 | 552.3
Junior convertible securities | $ 343.0 | $ 346.9

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