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Derivative Financial Instruments (Details 2) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Gains and losses recognized in cost of products sold on derivatives not designated as qualified hedging instruments    
Total gains (losses) recognized in cost of products sold $ (39.7) $ 8.5
Commodity Contracts [Member]    
Gains and losses recognized in cost of products sold on derivatives not designated as qualified hedging instruments    
Total gains (losses) recognized in cost of products sold (48.5) 5.2
Foreign currency exchange contracts [Member]    
Gains and losses recognized in cost of products sold on derivatives not designated as qualified hedging instruments    
Total gains (losses) recognized in cost of products sold $ 8.8 $ 3.3