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Fair Value of Financial Instruments - Schedule of Unobservable Inputs Used for Level Three Fair Value Measurements of Financial Instruments on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2013 | Sep. 30, 2012
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 419.0 | 206.0
Liabilities |  |
Liabilities, Fair Value Disclosure | 1,842.3 | 1,782.8
Asset-backed securities [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 5.3 | 15.9
Commercial mortgage-backed securities [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 6.2 | 5.0
Corporates [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 2.6 | 32.0
Hybrids [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 10.0 | 0
Broker-quoted [Member] | Asset-backed securities [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Broker-quoted |
Broker-quoted [Member] | Commercial mortgage-backed securities [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Market pricing |
Broker-quoted [Member] | Corporates [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Broker-quoted |
Broker-quoted [Member] | Hybrids [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Broker-quoted |
Market pricing [Member] | Corporates [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Broker-quoted |
Assets, Fair Value Disclosure | 353.9 | 103.3
Market pricing [Member] | Hybrids [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Broker-quoted |
Assets, Fair Value Disclosure |  | 8.8
Contingent purchase price reduction receivable [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 41.0 | 41.0
Contingent purchase price reduction receivable [Member] | Discounted cash flow [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Discounted cash flow |
FIA embedded derivatives, included in contractholder funds [Member] |  |
Liabilities |  |
Liabilities, Fair Value Disclosure | 1,639.6 | 1,550.8
FIA embedded derivatives, included in contractholder funds [Member] | Discounted cash flow [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Discounted cash flow |
Equity conversion feature of preferred stock [Member] |  |
Liabilities |  |
Liabilities, Fair Value Disclosure | 202.7 | 232.0
Equity conversion feature of preferred stock [Member] | Monte Carlo simulation / Option model [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Monte Carlo simulation / Option model |
Minimum [Member] | Asset-backed securities [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Offered quotes |  | 100.00%
Minimum [Member] | Corporates [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Quoted prices | 0.00% | 0.00%
Offered quotes | 88.00% | 88.00%
Minimum [Member] | Hybrids [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Quoted prices |  | 0.00%
Minimum [Member] | Contingent purchase price reduction receivable [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Probability of collection | 88.00% | 88.00%
Minimum [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |
Liabilities |  |
Market value of option | 0.00% | 0.00%
SWAP rates | 0.95% | 0.76%
Surrender rates | 0.50% | 2.00%
Non-performance spread | 0.25% | 0.25%
Minimum [Member] | Equity conversion feature of preferred stock [Member] |  |
Liabilities |  |
Annualized volatility of equity | 43.00% | 41.00%
Discount yield | 11.00% | 12.00%
Calibration adjustment | 12.00% | 10.00%
Maximum [Member] | Asset-backed securities [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Offered quotes | 109.00% | 110.00%
Maximum [Member] | Commercial mortgage-backed securities [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Offered quotes |  | 101.00%
Maximum [Member] | Corporates [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Quoted prices | 141.00% | 141.00%
Offered quotes | 116.00% | 158.00%
Maximum [Member] | Hybrids [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Quoted prices |  | 103.00%
Maximum [Member] | Contingent purchase price reduction receivable [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Probability of collection | 96.00% | 96.00%
Expected term | 9 months | 9 months
Discount rate | 0.94% | 0.72%
Credit insurance risk premium | 11.00% | 12.00%
Maximum [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |
Liabilities |  |
Market value of option | 35.00% | 31.00%
SWAP rates | 2.00% | 2.00%
Mortality multiplier | 80.00% | 70.00%
Surrender rates | 75.00% | 50.00%
Non-performance spread | 0.25% | 0.25%
Maximum [Member] | Equity conversion feature of preferred stock [Member] |  |
Liabilities |  |
Discount yield |  | 13.00%
Non-cash accretion rate | 0.00% | 0.00%
Calibration adjustment | 14.00% | 13.00%
Weighted average [Member] | Asset-backed securities [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Offered quotes |  | 103.00%
Weighted average [Member] | Commercial mortgage-backed securities [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Offered quotes | 104.00% |
Weighted average [Member] | Corporates [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Quoted prices | 91.00% | 69.00%
Offered quotes | 123.00% | 98.00%
Weighted average [Member] | Hybrids [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Quoted prices |  | 25.00%
Offered quotes | 100.00% |
Weighted average [Member] | Contingent purchase price reduction receivable [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Probability of collection | 92.00% | 92.00%
Weighted average [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |
Liabilities |  |
Market value of option | 4.00% | 4.00%
SWAP rates | 1.50% | 1.00%
Surrender rates | 7.00% | 7.00%
Non-performance spread | 0.25% | 0.25%
Weighted average [Member] | Equity conversion feature of preferred stock [Member] |  |
Liabilities |  |
Discount yield |  | 12.00%
Calibration adjustment | 13.00% | 11.00%

X
- Definition Fair value inputs market value of option. + References No definition available. + Details
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Period Type: | duration

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- Definition Fair value measurements annualized volatility of equity. + References No definition available. + Details
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- Definition Fair value measurements calibration adjustment. + References No definition available. + Details
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- Definition Credit insurance risk premium. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Discount yield. + References No definition available. + Details
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Period Type: | duration

X
- Definition Mortality multiplier. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Non-cash accretion rate. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

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- Definition Non-performance spread. + References No definition available. + Details
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Period Type: | duration

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- Definition Offered quotes. + References No definition available. + Details
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Period Type: | duration

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- Definition Fair value measurements probability of collection. + References No definition available. + Details
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- Definition Fair value measurements quoted prices. + References No definition available. + Details
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Period Type: | duration

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- Definition Surrender rates. + References No definition available. + Details
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Period Type: | duration

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- Definition Fair value measurements swap rates. + References No definition available. + Details
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Period Type: | duration

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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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