Pensions (Details) - Pension [Member] $ in Millions		3 Months Ended		6 Months Ended
		Sep. 30, 2015 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Participant	Sep. 30, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items]
Contributions by employer		$ 1.5	$ 2.0	$ 2.8	$ 3.8
Pension plans [Abstract]
Service cost		0.2	0.2	0.3	0.3
Interest cost		3.1	3.2	6.1	6.5
Expected return on plan assets		(4.4)	(4.2)	(8.7)	(8.4)
Amortization of unrecognized net loss		1.8	1.4	3.6	2.8
Settlements	[1]	39.2	0.0	39.2	0.0
Net periodic benefit cost		$ 39.9	$ 0.6	$ 40.5	$ 1.2
Number of participants accepted lump-sum payout program | Participant				2,000
Amount paid for settlement lump-sum payout program				$ 60.8
Discount rate		4.40%		4.40%
Increase in underfunded status				$ 4.1
Selling, General and Administrative Expenses [Member]
Pension plans [Abstract]
Settlements		$ 30.9		30.9
Cost of Sales [Member]
Pension plans [Abstract]
Settlements		$ 8.3		$ 8.3

[1] During September 2015, in an effort to reduce the size, volatility, mortality risk, and costs associated with its U.S. pension plans, the Company completed a voluntary lump-sum payout program offered to certain eligible former employees. Approximately 2,000 participants accepted the lump-sum settlement offer, and a total of $60.8 million was paid from pension plan assets, which reduced the Company's pension obligation by the same amount. In connection with this settlement, the Company remeasured the assets and liabilities of its U.S. pension plans using a discount rate of 4.4 percent. The remeasurement resulted in a $4.1 million increase in the plans' underfunded status and a $39.2 million non-cash charge in the second quarter of fiscal 2016, related to the accelerated recognition of unamortized actuarial losses previously recorded on the consolidated balance sheets within accumulated other comprehensive loss. The Company recorded $30.9 million and $8.3 million of the settlement loss to SG&A expenses and cost of sales, respectively, within the consolidated statement of operations.