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Derivative Financial Instruments (Details 2) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
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 $ (7.0) $ (25.6) $ (5.6) $ (54.2)
Commodity contracts        
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 (7.3) (25.8) (4.8) (55.9)
Foreign currency exchange contracts        
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 $ 0.3 $ 0.2 $ (0.8) $ 1.7