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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 | 9 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Sep. 30, 2012
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Document Period End Date | Jun. 30, 2013 |
Assets, Fair Value Disclosure | $ 502.7 | $ 206.0
Liabilities |  |
Liabilities, Fair Value Disclosure | 1,733.2 | 1,782.8
Asset-backed securities [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 5.1 | 15.9
Commercial mortgage-backed securities [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 5.9 | 5.0
Corporates [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 38.8 | 32.0
Hybrids [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Assets, Fair Value Disclosure | 11.7 | 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 | Market Pricing |
Market pricing [Member] | Corporates [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Broker-quoted |
Assets, Fair Value Disclosure | 400.2 | 103.3
Market pricing [Member] | Hybrids [Member] |  |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |  |
Valuation Technique | Market Pricing |
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 | 1,585.9 | 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 | $ 147.3 | $ 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 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 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=25499696&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=25499696&loc=d3e19207-110258 + Details
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