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Fair Value Measurements - Other Financial Liabilities Not Carried at Fair Value (Details) - Level 2 - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Senior notes | $ 1,098.0 | $ 1,097.3
Junior subordinated notes | 765.8 | 565.7
Junior convertible securities | 299.5 | 318.4
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Senior notes | 1,165.6 | 1,206.6
Junior subordinated notes | 809.1 | 623.1
Junior convertible securities | $ 461.4 | $ 427.6

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