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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2017
Derivative [Line Items]      
Remaining maturity of forward foreign exchange contracts, maximum 15 months    
Net unrealized fair value gain (loss) on foreign exchange contracts, effective portion $ 0.7 $ (2.6)  
Net unrealized fair value gain (loss) on foreign exchange contracts that did not qualify as effective hedge contracts 0.0 $ (0.4)  
Amounts reclassified out of accumulated other comprehensive loss into earnings 0.0    
Foreign currency cash flow hedge gain estimated to be reclassified into earnings during next 12 months (less than $1 million) 1.0    
Other Assets | Foreign Exchange Forward      
Derivative [Line Items]      
Derivative asset 1.5   $ 0.6
Accounts Payable and Accrued Liabilities | Foreign Exchange Forward      
Derivative [Line Items]      
Derivative liability $ 0.6   $ 0.5