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Derivative Instruments and Hedging Activities (Forward Contracts by Balance Sheet Location) (Details) - Designated as Hedging Instrument - USD ($)
$ in Millions
Sep. 30, 2019
Mar. 31, 2019
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset $ 1.6 $ 1.5
Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0.7 0.6
Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 130.3 63.6
Forward exchange contracts | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 1.6 1.5
Forward exchange contracts | Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0.7 0.6
Forward exchange contracts | Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0.0 0.0
Interest rate swap agreements | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.0 0.0
Interest rate swap agreements | Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0.0 0.0
Interest rate swap agreements | Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability $ 130.3 $ 63.6