Derivative Instruments (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Derivative Instrument Detail [Abstract]
Percentage of company sales denominated in U.S. dollars (in hundredths)			99.00%
Foreign Currency Transaction Gain (Loss), Realized	$ 0.2	$ (0.9)	$ (0.8)	$ (0.2)