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Financial Instruments (Forward Contracts by Balance Sheet Location) (Details) - Designated as Hedging Instrument - USD ($)
$ in Millions
Mar. 31, 2019
Mar. 31, 2018
[1]
Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset $ 1.5 $ 0.3
Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0.6 0.6
Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 63.6  
Foreign Exchange Contracts | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 1.5 0.3
Foreign Exchange Contracts | Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0.6 $ 0.6
Foreign Exchange Contracts | Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0.0  
Interest Rate Swap | Other Current Assets    
Derivatives, Fair Value [Line Items]    
Derivative Asset 0.0  
Interest Rate Swap | Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability 0.0  
Interest Rate Swap | Other Non-Current Liabilities    
Derivatives, Fair Value [Line Items]    
Derivative Liability $ 63.6  
[1] Includes an immaterial amount of forward foreign exchange contracts not designated as hedging instruments as of March 31, 2018.