Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions		3 Months Ended
		Jun. 30, 2015	Jun. 30, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		$ (198.6)	$ (103.9)
Other comprehensive income before reclassifications		8.7	1.5
Income taxes		(0.6)	(0.5)
Total other comprehensive (loss) income		9.9	2.4
Ending balance		(188.7)	(101.5)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications for amortization of unrecognized net loss	[1]	1.8	1.4
Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(40.7)	27.3
Other comprehensive income before reclassifications		8.7	1.5
Income taxes		0.0	0.0
Total other comprehensive (loss) income		8.7	1.5
Ending balance		(32.0)	28.8
Foreign Currency Translation [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications for amortization of unrecognized net loss	[1]	0.0	0.0
Defined Benefit Plans [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance		(157.9)	(131.2)
Other comprehensive income before reclassifications		0.0	0.0
Income taxes		(0.6)	(0.5)
Total other comprehensive (loss) income		1.2	0.9
Ending balance		(156.7)	(130.3)
Defined Benefit Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications for amortization of unrecognized net loss	[1]	$ 1.8	$ 1.4

[1] Amounts are included in the calculation of net periodic benefit cost for the Company's defined benefit plans, which include pension and other postretirement plans. See Note 4 for additional information about the Company's pension plans.