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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 | 3 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013
Derivatives, Fair Value [Line Items] |  |
Document Period End Date | Dec. 31, 2013 |
Total asset derivatives | $ 294.5 | $ 221.8
Call options [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 294.1 | 221.8
Derivatives designated as hedging instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 4.6 | 2.1
Total liability derivatives | 5.5 | 5.2
Derivatives designated as hedging instruments [Member] | Commodity swap and option agreements [Member] | Receivables, net [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 1.3 | 0.4
Derivatives designated as hedging instruments [Member] | Commodity swap and option agreements [Member] | Other assets [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 0.3 | 0
Derivatives designated as hedging instruments [Member] | Foreign exchange forward agreements [Member] | Receivables, net [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 3.0 | 1.7
Derivatives designated as hedging instruments [Member] | Foreign exchange forward agreements [Member] | Accounts payable and other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 5.2 | 4.6
Derivatives designated as hedging instruments [Member] | Foreign exchange contracts [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 0.3 | 0.1
Derivatives designated as hedging instruments [Member] | Commodity contracts [Member] | Accounts payable and other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 0 | 0.5
Not Designated as Hedging Instrument [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 299.7 | 227.7
Total liability derivatives | 2,034.0 | 1,888.6
Not Designated as Hedging Instrument [Member] | Equity conversion feature of preferred stock [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 378.0 | 330.8
Not Designated as Hedging Instrument [Member] | Foreign exchange forward agreements [Member] | Accounts payable and other current liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives |  | 5.3
Not Designated as Hedging Instrument [Member] | Foreign exchange forward agreements [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 3.6 |
Not Designated as Hedging Instrument [Member] | Foreign exchange contracts [Member] | Receivables, net [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 0.2 | 0.1
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member] | Receivables, net [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives |  | 3.7
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member] | Derivatives For Trading And Investment [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 0.4 |
Not Designated as Hedging Instrument [Member] | Commodity contracts [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 2.2 | 1.9
Not Designated as Hedging Instrument [Member] | Call options [Member] | Derivatives For Trading And Investment [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 294.1 | 221.8
Not Designated as Hedging Instrument [Member] | FIA embedded derivatives [Member] | Contractholder funds [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 1,644.7 | 1,544.4
Not Designated as Hedging Instrument [Member] | Futures contracts [Member] | Derivatives For Trading And Investment [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 0.4 | 0
Not Designated as Hedging Instrument [Member] | Futures contracts [Member] | Other liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives |  | $ 1.0

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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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