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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Mar. 31, 2017
Derivative [Line Items]
Remaining maturity of forward foreign exchange contracts, maximum			24 months
Net unrealized fair value gain (loss) on foreign exchange contracts, effective portion	$ (0.8)	$ (0.4)	$ (0.1)	$ (3.0)
Net unrealized fair value gain (loss) on foreign exchange contracts that did not qualify as effective hedge contracts	0.2	$ 0.0	0.2	$ (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)	(1.8)		(1.8)
Other Assets | Foreign Exchange Forward
Derivative [Line Items]
Derivative asset	2.2		2.2		$ 0.6
Accounts Payable and Accrued Liabilities | Foreign Exchange Forward
Derivative [Line Items]
Derivative liability	$ 2.3		$ 2.3		$ 0.5

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