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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, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | $ 1,097.8 | $ 1,097.3
Junior subordinated notes | 765.8 | 565.7
Junior convertible securities | 301.4 | 318.4
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | 1,180.7 | 1,206.6
Junior subordinated notes | 804.3 | 623.1
Junior convertible securities | $ 457.7 | $ 427.6

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