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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