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Derivative Financial Instruments (Details) - Not designated as hedging instruments [Member] - USD ($)
$ in Millions
Apr. 30, 2018
Apr. 30, 2017
Other Current Assets [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets $ 17.0 $ 8.4
Other Current Assets [Member] | Commodity contracts [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 14.8 5.2
Other Current Assets [Member] | Foreign currency exchange contracts [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 2.2 3.2
Other Current Liabilities [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 7.5 21.3
Other Current Liabilities [Member] | Commodity contracts [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 6.8 21.2
Other Current Liabilities [Member] | Foreign currency exchange contracts [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 0.7 0.1
Other Noncurrent Assets [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 0.4 0.0
Other Noncurrent Assets [Member] | Commodity contracts [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 0.4 0.0
Other Noncurrent Assets [Member] | Foreign currency exchange contracts [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 0.0 0.0
Other Noncurrent Liabilities [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 0.2 0.0
Other Noncurrent Liabilities [Member] | Commodity contracts [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 0.2 0.0
Other Noncurrent Liabilities [Member] | Foreign currency exchange contracts [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities $ 0.0 $ 0.0