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Derivative Financial Instruments - Summary of Gain (Loss) Recognized in Income on Derivatives (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $ (0.1) | $ 0 | $ 0
Equity conversion feature of preferred stock | Gain from the change in the fair value of the equity conversion feature of preferred stock |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain Recognized in Income on Derivatives | (12.7) | (101.6) | (156.6)
Commodity contracts | Other (expense) income, net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain Recognized in Income on Derivatives | (6.6) | (1.3) | 0
Bronze Commodity Contract | Consumer products cost of goods sold |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain Recognized in Income on Derivatives | (0.1) | (0.1) | 0
Foreign exchange contracts | Other (expense) income, net |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain Recognized in Income on Derivatives | 3.1 | (3.6) | 5.9
Call options | Net investment gains |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain Recognized in Income on Derivatives | (246.0) | (151.6) | (100.0)
Futures contracts | Net investment gains |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain Recognized in Income on Derivatives | (25.5) | (17.5) | (46.0)
Available-for-sale embedded derivatives | Net Investment Income |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain Recognized in Income on Derivatives | 0 | 0 | (0.4)
FIA embedded derivatives | Benefits and other changes in policy reserves |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gain Recognized in Income on Derivatives | $ 363.7 | $ (6.4) | $ 154.5

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- Definition Amount of increase (decrease) in the fair value of derivatives recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5618551-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (a),(c),(d),(e) -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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- Definition Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=35706170&loc=SL5624171-113959 + Details
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