Other Income and Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Other Income and Expense [Abstract]
Equity in earnings (loss) of non-consolidated affiliate	$ 0.3	$ (0.1)	$ 0.5
Interest income	0.9	0.8	0.7
Foreign currency transactions	(1.1)	(7.8)	2.3
Other non-operating income	0.1	0	0.1
Total other income (expense) - net	$ 0.2	$ (7.1)	$ 3.6