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Derivative Financial Instruments (Details 3) - USD ($) $ in Millions | 12 Months Ended
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Apr. 30, 2015 | Apr. 30, 2014 | Apr. 30, 2013
Unallocated Derivative Gains (Losses) |  |  |
Net (losses) gains on mark-to-market valuation of unallocated derivative positions | $ (39.7) | $ 8.5 |
Net losses (gains) on derivative positions reclassified to segment operating profit | 15.2 | (3.2) |
Net mark-to-market valuation of certain derivative positions recognized in unallocated derivative (losses) gains | $ (24.5) | $ 5.3 | $ 6.6

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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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