Income Taxes (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended				12 Months Ended
	Jun. 30, 2011	Mar. 31, 2011	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2012 Rate	Mar. 31, 2011 Rate	Mar. 31, 2010 Rate	Mar. 31, 2009
Income Taxes (Textual) [Abstract]
Foreign pre-tax earnings					$ 235.9	$ 240.1	$ 214.5
United States federal statutory rate					35.00%	35.00%	35.00%
Increase (decrease) in valuation allowance					10.4	1.0	(12.1)
Federal net operating loss carryforwards					111.4
Foreign net operating loss carryforwards					13.0
Operating loss carryforwards, expiration dates					between 2017 and 2031
Aggregate unremitted earnings of certain foreign subsidiaries					615.8
Approximate tax liability if aggregate unremitted earnings of certain foreign subsidiaries were repatriated or no longer indefinitely re-invested					138.3
Unrecognized tax benefits		55.8			56.8	55.8	106.4	106.3
Impact on effective tax rate if unrecognized tax benefits were recognized		49.7			50.3	49.7	95.1
Interest and penalties related to uncertain tax positions					3.9	7.7	2.4
Accrued interest and penalties related to uncertain tax positions		31.0			33.7	31.0
Net tax benefits related to the settlement of certain tax matters	$ 6.2	$ 25.2	$ 18.0	$ 14.0	$ 6.2	$ 57.2	$ 30.0