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Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument [Line Items]    
Debt $ 2,577.9 $ 2,490.4
Senior bank debt    
Debt Instrument [Line Items]    
Debt 349.9 349.9
Senior notes    
Debt Instrument [Line Items]    
Debt 1,094.0 1,093.5
Junior subordinated notes    
Debt Instrument [Line Items]    
Debt 751.4 751.4
Junior convertible securities    
Debt Instrument [Line Items]    
Debt $ 382.6 $ 295.6