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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Condensed Consolidated Statements of Comprehensive Income    
Currency translation adjustments, tax expense $ 0.6  
Derivative instruments unrealized losses, tax $ (0.2) $ (1.4)