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Derivative Financial Instruments (Details) - USD ($)
$ in Millions
Jan. 31, 2020
Apr. 30, 2019
Other Current Assets [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets $ 9.0 $ 6.2
Other Current Assets [Member] | Designated as Hedging Instrument [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 0.0 0.0
Other Current Assets [Member] | Not designated as hedging instruments [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 9.0 6.2
Other Current Assets [Member] | Interest rate contracts | Designated as Hedging Instrument [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 0.0 0.0
Other Current Assets [Member] | Commodity contracts | Not designated as hedging instruments [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 8.6 4.8
Other Current Assets [Member] | Foreign currency exchange contracts | Not designated as hedging instruments [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 0.4 1.4
Other Current Liabilities [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 185.4 75.1
Other Current Liabilities [Member] | Designated as Hedging Instrument [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 168.9 49.1
Other Current Liabilities [Member] | Not designated as hedging instruments [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 16.5 26.0
Other Current Liabilities [Member] | Interest rate contracts | Designated as Hedging Instrument [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 168.9 49.1
Other Current Liabilities [Member] | Commodity contracts | Not designated as hedging instruments [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 16.4 25.8
Other Current Liabilities [Member] | Foreign currency exchange contracts | Not designated as hedging instruments [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 0.1 0.2
Other Noncurrent Assets [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 0.0 0.0
Other Noncurrent Assets [Member] | Designated as Hedging Instrument [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 0.0 0.0
Other Noncurrent Assets [Member] | Not designated as hedging instruments [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 0.0 0.0
Other Noncurrent Assets [Member] | Interest rate contracts | Designated as Hedging Instrument [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 0.0 0.0
Other Noncurrent Assets [Member] | Commodity contracts | Not designated as hedging instruments [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Assets 0.0 0.0
Other Noncurrent Assets [Member] | Foreign currency exchange contracts | Not designated as hedging instruments [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 0.0 0.0
Other Noncurrent Liabilities [Member] | Designated as Hedging Instrument [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 0.0 0.0
Other Noncurrent Liabilities [Member] | Not designated as hedging instruments [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 0.0 0.0
Other Noncurrent Liabilities [Member] | Interest rate contracts | Designated as Hedging Instrument [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 0.0 0.0
Other Noncurrent Liabilities [Member] | Commodity contracts | Not designated as hedging instruments [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities 0.0 0.0
Other Noncurrent Liabilities [Member] | Foreign currency exchange contracts | Not designated as hedging instruments [Member]    
Fair value of derivative instruments [Line Items]    
Derivatives Instruments, Liabilities $ 0.0 $ 0.0