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Financial Instruments (Forward Contracts by Balance Sheet Location) (Details) - Foreign Exchange Forward - USD ($)
$ in Millions
Mar. 31, 2018
Mar. 31, 2017
Other Assets    
Derivatives, Fair Value [Line Items]    
Derivative asset [1] $ 0.3 $ 0.6
Accounts Payable and Accrued Liabilities    
Derivatives, Fair Value [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.