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Derivative Financial Instruments - Summary of Gain (Loss) Recognized in Income on Derivatives (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Increase Decrease In Fair Value Of Equity Conversion Feature Of Preferred Stock |  | $ (38.0) |  | $ 12.7
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $ (0.5) | 0.3 | $ 0.5 | 0.3
Equity Conversion Feature Of Preferred Stock [Member] | Increase Decrease In Fair Value Of Equity Conversion Feature Of Preferred Stock [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Three months ended June 30, | 0.0 | 38.0 |  | (12.7)
Commodity contracts [Member] | Other (expense) income, net [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Three months ended June 30, | (2.7) | (2.2) | 21.3 | (12.4)
Bronze Commodity Contract [Member] | Consumer products cost of goods sold [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Three months ended June 30, | 0.0 | 0.1 | 0.0 | 0.0
Bronze Commodity Contract [Member] | Net investment gains [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Three months ended June 30, | (0.5) | 0.3 | 0.5 | 0.3
Foreign Exchange Contract [Member] | Other (expense) income, net [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Three months ended June 30, | 5.0 | (0.2) | (2.4) | 0.4
Call options [Member] | Net investment gains [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Three months ended June 30, | (7.6) | 91.1 | 25.6 | 226.6
Futures contracts [Member] | Net investment gains [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Three months ended June 30, | 0.0 | 10.5 | 4.3 | 24.9
FIA embedded derivatives [Member] | Benefits and other changes in policy reserves [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Three months ended June 30, | $ (43.7) | $ 145.8 | $ 265.6 | $ 320.1

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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=56946850&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=56946850&loc=SL5624171-113959 + Details
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