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Debt - Summary of Company's Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt $ 1,780.7 $ 1,829.6
Senior bank debt    
Debt Instrument [Line Items]    
Debt 459.7 779.7
Senior notes    
Debt Instrument [Line Items]    
Debt 742.8 742.5
Junior convertible securities    
Debt Instrument [Line Items]    
Debt 308.2 307.4
Junior subordinated notes    
Debt Instrument [Line Items]    
Debt $ 270.0 $ 0.0