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Financial Instruments (Forward Contracts) (Details) € in Millions, £ in Millions, NZD in Millions, HUF in Millions, CAD in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2015 USD ($)	Mar. 31, 2017 NZD	Mar. 31, 2017 EUR (€)	Mar. 31, 2017 CAD	Mar. 31, 2017 HUF	Mar. 31, 2017 GBP (£)
Derivative [Line Items]
Remaining maturity of forward foreign exchange contracts, maximum	12 months
Net unrealized fair value gain (loss) on foreign exchange contracts, effective portion	$ (3.5)	$ (0.2)	$ 2.8
Net unrealized fair value gain (loss) on foreign exchange contracts that did not qualify as effective hedge contracts	(1.0)	1.3	$ 0.4
Foreign currency cash flow hedge gain (loss) reclassified to earnings	5.0
British Pound Sterling | Foreign Exchange Forward
Derivative [Line Items]
Foreign Currency Amount | £								£ 16.5
US Dollar Amount	$ 20.5
Weighted average exchange rate per $1 USD	0.81			0.81	0.81	0.81	0.81	0.81
Hungary, Forint | Foreign Exchange Forward
Derivative [Line Items]
Foreign Currency Amount | HUF							HUF 1,038.5
US Dollar Amount	$ 3.9
Weighted average exchange rate per $1 USD	269.26			269.26	269.26	269.26	269.26	269.26
Euro Member Countries, Euro | Foreign Exchange Forward
Derivative [Line Items]
Foreign Currency Amount | €					€ 1.8
US Dollar Amount	$ 2.0
Weighted average exchange rate per $1 USD	0.88			0.88	0.88	0.88	0.88	0.88
Canadian Dollar | Foreign Exchange Forward
Derivative [Line Items]
Foreign Currency Amount | CAD						CAD 24.7
US Dollar Amount	$ 18.8
Weighted average exchange rate per $1 USD	1.31			1.31	1.31	1.31	1.31	1.31
New Zealand, Dollars | Foreign Exchange Forward
Derivative [Line Items]
Foreign Currency Amount | NZD				NZD 3.3
US Dollar Amount	$ 2.4
Weighted average exchange rate per $1 USD	0.73			0.73	0.73	0.73	0.73	0.73
Other Assets | Foreign Exchange Forward
Derivative [Line Items]
Derivative asset	$ 0.6	9.4
Accounts Payable and Accrued Liabilities | Foreign Exchange Forward
Derivative [Line Items]
Derivative liability	$ 0.5	$ 0.7

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