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Fair Value Measurements - Other Financial Liabilities Not Carried at Fair Value (Details) - Level 2 - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Senior notes | $ 1,098.7 | $ 1,098.0
Junior subordinated notes | 765.9 | 765.8
Junior convertible securities | 341.7 | 299.5
Fair Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Senior notes | 1,024.6 | 1,165.6
Junior subordinated notes | 552.3 | 809.1
Junior convertible securities | $ 346.9 | $ 461.4

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