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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Mar. 31, 2017
Derivative [Line Items]          
Remaining maturity of forward foreign exchange contracts, maximum     21 months    
Net unrealized fair value gain (loss) on foreign exchange contracts, effective portion $ (0.3) $ (1.9) $ (0.5) $ (4.9)  
Net unrealized fair value gain (loss) on foreign exchange contracts that did not qualify as effective hedge contracts (0.2) $ 0.0 0.0 $ (0.4)  
Amounts reclassified out of accumulated other comprehensive loss into earnings 0.0   0.0    
Foreign currency cash flow hedge gain estimated to be reclassified into earnings during next 12 months (less than $1 million) 0.8   0.8    
Other Assets | Foreign Exchange Forward          
Derivative [Line Items]          
Derivative asset 1.0   1.0   $ 0.6
Accounts Payable and Accrued Liabilities | Foreign Exchange Forward          
Derivative [Line Items]          
Derivative liability $ 1.7   $ 1.7   $ 0.5