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Derivative Financial Instruments (Details) - USD ($) $ in Millions | Apr. 30, 2015 | Apr. 30, 2014
--- | --- | ---
Other Current Assets [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Assets | $ 11.2 | $ 54.4
Other Current Assets [Member] | Designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Assets | 0.0 | 41.4
Other Current Assets [Member] | Not designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Assets | 11.2 | 13.0
Other Current Assets [Member] | Commodity contracts [Member] | Designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Assets | 0.0 | 23.4
Other Current Assets [Member] | Commodity contracts [Member] | Not designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Assets | 6.4 | 11.6
Other Current Assets [Member] | Interest rate contract [Member] | Designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Assets | 0.0 | 18.0
Other Current Assets [Member] | Foreign currency exchange contracts [Member] | Not designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Assets | 4.8 | 1.4
Other Current Liabilities [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Liabilities | 24.9 | 17.4
Other Current Liabilities [Member] | Designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Liabilities | 0.0 | 10.9
Other Current Liabilities [Member] | Not designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Liabilities | 24.9 | 6.5
Other Current Liabilities [Member] | Commodity contracts [Member] | Designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Liabilities | 0.0 | 10.9
Other Current Liabilities [Member] | Commodity contracts [Member] | Not designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Liabilities | 23.9 | 5.8
Other Current Liabilities [Member] | Interest rate contract [Member] | Designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Liabilities | 0.0 | 0.0
Other Current Liabilities [Member] | Foreign currency exchange contracts [Member] | Not designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Liabilities | 1.0 | 0.7
Other Noncurrent Assets [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Assets | 0.2 |
Other Noncurrent Assets [Member] | Designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Assets | 0.0 |
Other Noncurrent Assets [Member] | Not designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Assets | 0.2 |
Other Noncurrent Assets [Member] | Commodity contracts [Member] | Designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Assets | 0.0 |
Other Noncurrent Assets [Member] | Commodity contracts [Member] | Not designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Assets | 0.2 |
Other Noncurrent Assets [Member] | Interest rate contract [Member] | Designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Assets | 0.0 |
Other Noncurrent Assets [Member] | Foreign currency exchange contracts [Member] | Not designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Assets | 0.0 |
Other Noncurrent Liabilities [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Liabilities | 3.8 | 3.1
Other Noncurrent Liabilities [Member] | Designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Liabilities | 0.0 | 3.1
Other Noncurrent Liabilities [Member] | Not designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Liabilities | 3.8 | 0.0
Other Noncurrent Liabilities [Member] | Commodity contracts [Member] | Designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Liabilities | 0.0 | 0.0
Other Noncurrent Liabilities [Member] | Commodity contracts [Member] | Not designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Liabilities | 3.8 | 0.0
Other Noncurrent Liabilities [Member] | Interest rate contract [Member] | Designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Liabilities | 0.0 | 3.1
Other Noncurrent Liabilities [Member] | Foreign currency exchange contracts [Member] | Not designated as hedging instruments [Member] |  |
Fair value of derivative instruments [Line Items] |  |
Derivatives Instruments, Liabilities | $ 0.0 | $ 0.0

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