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INTEREST AND OTHER EXPENSE, NET (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
INTEREST AND OTHER EXPENSE, NET      
Interest income $ 20.0 $ 21.7 $ 14.0
Interest expense 68.9 67.8 88.7
Gains on foreign exchange transactions $ 19.9 $ 39.7 $ 33.1