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Debt (Loss (Gain) on Extinguishment of Debt) (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Mar. 31, 2020
Debt Instrument [Line Items]      
Loss (gain) on extinguishment of debt $ 28.2 $ 0.0 $ (5.4)
Term Loan B      
Debt Instrument [Line Items]      
Loss (gain) on extinguishment of debt 0.2    
Revolving Credit Facility, Term Loan A and Senior Notes      
Debt Instrument [Line Items]      
Loss (gain) on extinguishment of debt 26.4    
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances 62.1    
Total 88.5    
Revolving Credit Facility, Term Loan A and Senior Notes | New Debt Issuance Costs and Call Premiums      
Debt Instrument [Line Items]      
Loss (gain) on extinguishment of debt 21.2    
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances 31.0    
Total 52.2    
Revolving Credit Facility, Term Loan A and Senior Notes | Previously Incurred Debt Issuance Costs      
Debt Instrument [Line Items]      
Loss (gain) on extinguishment of debt 5.2    
Recorded as a Reduction of Outstanding Debt Balances & Amortized Over Life of New Issuances 31.1    
Total 36.3    
Revolving Credit Facility, Term Loan B and Other      
Debt Instrument [Line Items]      
Loss (gain) on extinguishment of debt 1.8    
Revolving Credit Facility      
Debt Instrument [Line Items]      
Loss (gain) on extinguishment of debt $ 1.1    
Senior Notes      
Debt Instrument [Line Items]      
Loss (gain) on extinguishment of debt     (1.1)
Term Loan | Term Loan B, Repurchases      
Debt Instrument [Line Items]      
Loss (gain) on extinguishment of debt     (5.7)
Term Loan | Term Loan B, Prepayments      
Debt Instrument [Line Items]      
Loss (gain) on extinguishment of debt     $ 1.4