Pensions (Details) - Pension [Member] $ in Millions		3 Months Ended		9 Months Ended
		Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) Participant
Defined Benefit Plan Disclosure [Line Items]
Aggregate funded status		$ 14.3		$ 14.3
Contributions by employer				6.3	$ 5.2
Components of net periodic benefit cost [Abstract]
Service cost		0.1	$ 0.1	0.4	0.4
Interest cost		2.5	2.5	7.3	8.6
Expected return on plan assets		(3.1)	(3.1)	(9.2)	(11.8)
Amortization of unrecognized net loss		1.4	1.4	4.2	5.0
Settlements	[1]	0.0	1.1	0.0	40.3
Net periodic benefit cost		$ 0.9	$ 2.0	2.7	$ 42.5
Number of participants accepted lump-sum payout program | Participant					2,000
Amount paid for settlement lump-sum payout program					$ 62.4
Selling, General and Administrative Expenses [Member]
Components of net periodic benefit cost [Abstract]
Settlements				31.8	31.8
Cost of Sales [Member]
Components of net periodic benefit cost [Abstract]
Settlements				$ 8.5	$ 8.5

[1] During fiscal 2016, in an effort to reduce the size, volatility, mortality risk, and costs associated with its U.S. pension plans, the Company offered a voluntary lump-sum payout program to certain eligible former employees. Approximately 2,000 participants accepted the lump-sum settlement offer and a total of $62.4 million was paid from pension plan assets during the nine months ended December 31, 2015, which reduced the Company's pension obligation by the same amount. In connection with these lump-sum payouts, the Company recorded $40.3 million of non-cash settlement losses related to the accelerated recognition of unamortized actuarial losses previously recorded on the consolidated balance sheets within accumulated other comprehensive loss. The Company recorded $31.8 million and $8.5 million of the settlement losses as SG&A expenses and cost of sales, respectively, within the consolidated statement of operations.