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Derivative Financial Instruments (Details 1) - USD ($)
$ in Millions
12 Months Ended
Apr. 30, 2015
Apr. 30, 2014
Apr. 30, 2013
Cash flow hedging derivative instruments gain (loss)      
(Losses) gains recognized in other comprehensive (loss) income (effective portion) $ (4.0) $ 21.0  
Change in accumulated other comprehensive loss (32.5) 41.9  
Cash Flow Hedging [Member] | Commodity Contracts [Member] | Cost of Products Sold [Member]      
Cash flow hedging derivative instruments gain (loss)      
Gains (losses) reclassified from accumulated other comprehensive loss to earnings (effective portion) 29.1 (20.3) $ (39.6)
Gains (losses) recognized in earnings (ineffective portion) 0.0 1.4  
Cash Flow Hedging [Member] | Interest Rate Contract [Member] | Interest Expense [Member]      
Cash flow hedging derivative instruments gain (loss)      
Gains (losses) recognized in earnings (ineffective portion) (0.1) 0.0  
Fair Value Hedging [Member] | Interest Rate Contract [Member] | Interest Expense [Member]      
Cash flow hedging derivative instruments gain (loss)      
Gains (losses) reclassified from accumulated other comprehensive loss to earnings (effective portion) $ (0.6) $ (0.6) $ (0.5)