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Fair Value Measurements - Financial Assets and Liabilities (Details) - Level 2 - USD ($) $ in Millions | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | $ 1,097.5 | $ 1,097.3
Junior convertible securities | 308.8 | 318.4
Junior subordinated notes | 565.8 | 565.7
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions |  |
Senior notes | 1,180.2 | 1,206.6
Junior convertible securities | 459.9 | 427.6
Junior subordinated notes | $ 593.0 | $ 623.1

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