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Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive (Loss) Income, Beginning Balance |  | $ (51.6) | $ (76.6) | $ (84.0)
Reclassification adjustments |  | (18.7) | 30.5 | 60.5
Current period (charge) credit |  | (54.3) | 24.5 | (46.4)
Income tax benefit (expense) |  | 14.8 | (30.0) | (6.7)
Accumulated Other Comprehensive (Loss) Income, Ending Balance |  | (109.8) | (51.6) | (76.6)
Foreign Currency Translation Adjustment [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive (Loss) Income, Beginning Balance |  | 31.7 | 61.5 | 67.0
Reclassification adjustments |  | 0.0 | 0.0 | 0.0
Current period (charge) credit |  | (34.0) | (29.8) | (5.5)
Income tax benefit (expense) |  | 0.0 | 0.0 | 0.0
Accumulated Other Comprehensive (Loss) Income, Ending Balance |  | (2.3) | 31.7 | 61.5
Unrealized (Loss) Gain on Cash Flow Hedging Derivatives [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive (Loss) Income, Beginning Balance | [1] | 15.3 | (11.2) | (19.2)
Reclassification adjustments | [1] | (28.5) | 20.9 | 40.1
Current period (charge) credit | [1] | (4.0) | 21.0 | (27.5)
Income tax benefit (expense) | [1] | 12.0 | (15.4) | (4.6)
Accumulated Other Comprehensive (Loss) Income, Ending Balance | [1] | (5.2) | 15.3 | (11.2)
Pension and Other Postretirement Liabilities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive (Loss) Income, Beginning Balance | [2] | (102.0) | (131.4) | (134.3)
Reclassification adjustments | [2] | 9.8 | 13.3 | 20.4
Current period (charge) credit | [2] | (16.2) | 31.4 | (16.5)
Income tax benefit (expense) | [2] | 2.8 | (15.3) | (1.0)
Accumulated Other Comprehensive (Loss) Income, Ending Balance | [2] | (105.6) | (102.0) | (131.4)
Unrealized Gain On Available-for-Sale Securities [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |
Accumulated Other Comprehensive (Loss) Income, Beginning Balance | [3] | 3.4 | 4.5 | 2.5
Reclassification adjustments | [3] | 0.0 | (3.7) | 0.0
Current period (charge) credit | [3] | (0.1) | 1.9 | 3.1
Income tax benefit (expense) | [3] | 0.0 | 0.7 | (1.1)
Accumulated Other Comprehensive (Loss) Income, Ending Balance | [3] | 3.3 | 3.4 | 4.5
Interest rate contract [Member] | Fair Value Hedging [Member] | Interest Expense [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) reclassified from accumulated other comprehensive loss to earnings (effective portion) |  | (0.6) | (0.6) | (0.5)
Commodity contracts [Member] | Cash Flow Hedging [Member] | Cost of Products Sold [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Gains (losses) reclassified from accumulated other comprehensive loss to earnings (effective portion) |  | $ 29.1 | $ (20.3) | $ (39.6)
[1] | Of the total reclassification adjustments from accumulated other comprehensive loss, $29.1 of income and $20.3 and $39.6 of expense were reclassified to cost of products sold related to commodity derivatives during 2015, 2014, and 2013, respectively. An additional $0.6 during 2015 and 2014, and $0.5 during 2013 was reclassified to interest expense related to the interest rate swap. At April 30, 2015, the remaining balance in accumulated other comprehensive loss related entirely to the interest rate swap.
[2] | Amortization of net losses was reclassified from accumulated other comprehensive loss to selling, distribution, and administrative expenses.
[3] | The gain on the sale of marketable securities was reclassified from accumulated other comprehensive loss to other income net during 2014.

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669686-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 + Details
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