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Long-Term Debt - Summary of Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
Dec. 07, 2017
Debt Instrument [Line Items]      
Total $ 1,238.0 $ 1,356.0  
Less current maturities 1.2 3.9  
Long-term debt 1,236.8 1,352.1  
Term loans | Credit Facility      
Debt Instrument [Line Items]      
Total 718.4 791.5  
Term loans | Senior notes      
Debt Instrument [Line Items]      
Unamortized original issue discount 6.6 8.5  
4.875% Senior notes due 2025 | Senior notes      
Debt Instrument [Line Items]      
Total 495.0 494.2  
Unamortized original issue discount $ 5.0 5.8  
Interest rate 4.875%   4.875%
Securitization facility borrowings | Other      
Debt Instrument [Line Items]      
Total $ 0.0 18.3  
Unamortized original issue discount 0.5    
Other subsidiary debt | Other      
Debt Instrument [Line Items]      
Total 24.6 $ 52.0  
Unamortized original issue discount $ 0.5