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Financial Instruments (Forward Contracts) (Details)
€ in Millions, £ in Millions, $ in Millions, $ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2018
AUD ($)
Mar. 31, 2018
CAD ($)
Mar. 31, 2018
EUR (€)
Mar. 31, 2018
GBP (£)
Mar. 31, 2017
USD ($)
Derivative [Line Items]            
Remaining maturity of forward foreign exchange contracts, maximum 18 months          
Foreign currency cash flow hedge gain (loss) to be reclassified during next 12 months $ (0.7)          
British Pound Sterling | Foreign Exchange Forward            
Derivative [Line Items]            
Foreign Currency Amount | £         £ 20.8  
US Dollar Amount $ 29.0          
Weighted average exchange rate per $1 USD 0.72 0.72 0.72 0.72 0.72  
Euro Member Countries, Euro | Foreign Exchange Forward            
Derivative [Line Items]            
Foreign Currency Amount | €       € 1.5    
US Dollar Amount $ 1.7          
Weighted average exchange rate per $1 USD 0.87 0.87 0.87 0.87 0.87  
Canadian Dollar | Foreign Exchange Forward            
Derivative [Line Items]            
Foreign Currency Amount     $ 15.1      
US Dollar Amount $ 12.1          
Weighted average exchange rate per $1 USD 1.25 1.25 1.25 1.25 1.25  
Australia, Dollars | Foreign Exchange Forward            
Derivative [Line Items]            
Foreign Currency Amount   $ 4.1        
US Dollar Amount $ 3.2          
Weighted average exchange rate per $1 USD 1.27 1.27 1.27 1.27 1.27  
Other Assets | Foreign Exchange Forward            
Derivative [Line Items]            
Derivative asset [1] $ 0.3         $ 0.6
Accounts Payable and Accrued Liabilities | Foreign Exchange Forward            
Derivative [Line Items]            
Derivative liability [1] $ 0.6         $ 0.5
[1] Includes an immaterial amount of forward foreign exchange contracts not designated as hedging instruments as of March 31, 2018 and 2017.