Product Warranties (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Changes in the warranty liability [Roll Forward]
Balance, beginning of period	$ 12.3	$ 12.8	$ 11.4	$ 14.7
Accruals for warranties issued in current period	1.2	1.6	4.0	5.0
Accruals (reversals) related to pre-existing warranties	0.3	0.3	1.5	(0.2)
Settlements made	(1.6)	(1.3)	(4.4)	(5.7)
Effect of exchange rate changes	0	(0.2)	(0.3)	(0.6)
Balance, end of period	$ 12.2	$ 13.2	$ 12.2	$ 13.2