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Derivative Financial Instruments - Fair Value of Outstanding Derivative Contracts in Condensed Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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Jun. 30, 2014 | Sep. 30, 2013 | Jun. 30, 2014 Call options [Member] | Sep. 30, 2013 Call options [Member] | Jun. 30, 2014 Derivatives designated as hedging instruments [Member] | Sep. 30, 2013 Derivatives designated as hedging instruments [Member] | Jun. 30, 2014 Derivatives designated as hedging instruments [Member] Interest Rate Contract [Member] Accounts payable and other current liabilities [Member] | Sep. 30, 2013 Derivatives designated as hedging instruments [Member] Interest Rate Contract [Member] Accounts payable and other current liabilities [Member] | Jun. 30, 2014 Derivatives designated as hedging instruments [Member] Interest Rate Contract [Member] Other liabilities [Member] | Sep. 30, 2013 Derivatives designated as hedging instruments [Member] Interest Rate Contract [Member] Other liabilities [Member] | Jun. 30, 2014 Derivatives designated as hedging instruments [Member] Commodity swap and option agreements [Member] Receivables, net [Member] | Sep. 30, 2013 Derivatives designated as hedging instruments [Member] Commodity swap and option agreements [Member] Receivables, net [Member] | Jun. 30, 2014 Derivatives designated as hedging instruments [Member] Foreign exchange forward agreements [Member] Receivables, net [Member] | Sep. 30, 2013 Derivatives designated as hedging instruments [Member] Foreign exchange forward agreements [Member] Receivables, net [Member] | Jun. 30, 2014 Derivatives designated as hedging instruments [Member] Foreign exchange forward agreements [Member] Accounts payable and other current liabilities [Member] | Sep. 30, 2013 Derivatives designated as hedging instruments [Member] Foreign exchange forward agreements [Member] Accounts payable and other current liabilities [Member] | Jun. 30, 2014 Derivatives designated as hedging instruments [Member] Foreign exchange contracts [Member] Other assets [Member] | Sep. 30, 2012 Derivatives designated as hedging instruments [Member] Foreign exchange contracts [Member] Other assets [Member] | Jun. 30, 2014 Derivatives designated as hedging instruments [Member] Foreign exchange contracts [Member] Other liabilities [Member] | Sep. 30, 2013 Derivatives designated as hedging instruments [Member] Foreign exchange contracts [Member] Other liabilities [Member] | Jun. 30, 2014 Derivatives designated as hedging instruments [Member] Commodity contracts [Member] Accounts payable and other current liabilities [Member] | Sep. 30, 2013 Derivatives designated as hedging instruments [Member] Commodity contracts [Member] Accounts payable and other current liabilities [Member] | Jun. 30, 2014 Not Designated as Hedging Instrument [Member] | Sep. 30, 2013 Not Designated as Hedging Instrument [Member] | Jun. 30, 2014 Not Designated as Hedging Instrument [Member] Equity conversion feature of preferred stock [Member] | Sep. 30, 2013 Not Designated as Hedging Instrument [Member] Equity conversion feature of preferred stock [Member] | Sep. 30, 2013 Not Designated as Hedging Instrument [Member] Foreign exchange forward agreements [Member] Accounts payable and other current liabilities [Member] | Jun. 30, 2014 Not Designated as Hedging Instrument [Member] Foreign exchange forward agreements [Member] Other liabilities [Member] | Jun. 30, 2014 Not Designated as Hedging Instrument [Member] Foreign exchange contracts [Member] Receivables, net [Member] | Sep. 30, 2013 Not Designated as Hedging Instrument [Member] Foreign exchange contracts [Member] Receivables, net [Member] | Sep. 30, 2013 Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Receivables, net [Member] | Jun. 30, 2014 Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Derivatives For Trading And Investment [Member] | Jun. 30, 2014 Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Other liabilities [Member] | Sep. 30, 2013 Not Designated as Hedging Instrument [Member] Commodity contracts [Member] Other liabilities [Member] | Jun. 30, 2014 Not Designated as Hedging Instrument [Member] Call options [Member] Derivatives For Trading And Investment [Member] | Sep. 30, 2013 Not Designated as Hedging Instrument [Member] Call options [Member] Derivatives For Trading And Investment [Member] | Jun. 30, 2014 Not Designated as Hedging Instrument [Member] FIA embedded derivatives [Member] Contractholder funds [Member] | Sep. 30, 2013 Not Designated as Hedging Instrument [Member] FIA embedded derivatives [Member] Contractholder funds [Member] | Jun. 30, 2014 Not Designated as Hedging Instrument [Member] Futures contracts [Member] Derivatives For Trading And Investment [Member] | Sep. 30, 2013 Not Designated as Hedging Instrument [Member] Futures contracts [Member] Derivatives For Trading And Investment [Member] | Jun. 30, 2014 Not Designated as Hedging Instrument [Member] Futures contracts [Member] Other liabilities [Member] | Sep. 30, 2013 Not Designated as Hedging Instrument [Member] Futures contracts [Member] Other liabilities [Member] | Jun. 30, 2014 Not Designated as Hedging Instrument [Member] Embedded Derivative Financial Instruments [Member] Derivatives For Trading And Investment [Member] | Sep. 30, 2013 Not Designated as Hedging Instrument [Member] Embedded Derivative Financial Instruments [Member] Derivatives For Trading And Investment [Member] | Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Foreign exchange forward agreements [Member] | Sep. 30, 2013 Fair Value, Measurements, Recurring [Member] Foreign exchange forward agreements [Member] | Jun. 30, 2014 Fair Value, Measurements, Recurring [Member] Call options [Member] | Sep. 30, 2013 Fair Value, Measurements, Recurring [Member] Call options [Member] | Jun. 30, 2014 Level 2 [Member] Fair Value, Measurements, Recurring [Member] Foreign exchange forward agreements [Member] | Sep. 30, 2013 Level 2 [Member] Fair Value, Measurements, Recurring [Member] Foreign exchange forward agreements [Member] | Jun. 30, 2014 Level 2 [Member] Fair Value, Measurements, Recurring [Member] Call options [Member] | Sep. 30, 2013 Level 2 [Member] Fair Value, Measurements, Recurring [Member] Call options [Member]
Derivatives, Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Document Period End Date | Jun. 30, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total asset derivatives |  |  | $ 324.6 | $ 221.8 | $ 2.1 | $ 2.1 |  |  |  |  | $ 1.3 | $ 0.4 | $ 0.7 | $ 1.7 |  |  | $ 0.1 | $ 0 |  |  |  |  | $ 338.6 | $ 227.7 |  |  |  |  | $ 0.1 | $ 0.1 | $ 3.7 | $ 0.1 |  |  | $ 324.6 | $ 221.8 |  |  | $ 0.1 | $ 0 |  |  | $ 11.6 | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Derivatives | 324.7 | 221.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.9 | [1] | 1.8 | [1] | 324.7 | [1] | 221.8 | [1] | 0.9 | [1] | 1.8 | [1] | 324.7 | [1] | 221.8 | [1]
Total liability derivatives |  |  |  |  | $ 7.2 | $ 5.2 | $ 1.8 | $ 0 | $ 0.1 | $ 0 |  |  |  |  | $ 5.0 | $ 4.6 |  |  | $ 0.3 | $ 0.1 | $ 0 | $ 0.5 | $ 1,876.3 | $ 1,888.6 | $ 0 | $ 330.8 | $ 5.3 | $ 0.3 |  |  |  |  | $ 4.3 | $ 1.9 |  |  | $ 1,864.5 | $ 1,544.4 |  |  | $ 0 | $ 1.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | The carrying amounts of trade receivables, accounts payable, accrued investment income and portions of other insurance liabilities approximate fair value due to their short duration and, accordingly, they are not presented in the tables above.

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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