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Derivative Financial Instruments (Details 4) - USD ($)
$ in Millions
Jan. 31, 2020
Apr. 30, 2019
Nov. 30, 2018
Jun. 30, 2018
Commodity contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gross notional amount $ 808.9 $ 544.8    
Foreign currency exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gross notional amount 88.1 144.9    
Interest rate contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Gross notional amount $ 800.0 $ 800.0 $ 300.0 $ 500.0