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Debt - Schedule of Debt (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Debt $ 2,490.4 $ 2,312.1
Senior bank debt    
Debt Instrument [Line Items]    
Debt 349.9 349.8
Senior notes    
Debt Instrument [Line Items]    
Debt 1,093.5 1,091.9
Junior subordinated notes    
Debt Instrument [Line Items]    
Debt 751.4 556.4
Junior convertible securities    
Debt Instrument [Line Items]    
Debt $ 295.6 $ 314.0