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Comprehensive Income (Details 1) (USD $)
In Millions
Jul. 31, 2011
Apr. 30, 2011
Accumulated other comprehensive income (loss), net of tax    
Postretirement benefits adjustment $ (161.2) $ (164.5)
Cumulative translation adjustment 38.8 48.1
Unrealized gain (loss) on cash flow hedge contracts (9.6) (13.6)
Accumulated other comprehensive income (loss), net of tax, Total $ (132.0) $ (130.0)