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Interest And Other Expense, Net (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Interest And Other Expense, Net [Abstract]        
Interest expense $ 18.3 $ 21.4 $ 51.1 $ 79.7
Gains on foreign exchange transactions $ 11.5 $ 12.9 $ 33.1 $ 21.4