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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, 2022 | Dec. 31, 2021
--- | --- | ---
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | $ 1,098.3 | $ 1,098.0
Junior subordinated notes | 765.8 | 765.8
Junior convertible securities | 341.7 | 299.5
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | 1,076.2 | 1,165.6
Junior subordinated notes | 638.7 | 809.1
Junior convertible securities | $ 326.5 | $ 461.4

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