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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	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	$ 523.5	$ 206.0
Liabilities
Liabilities, Fair Value Disclosure	1,875.2	1,782.8
Hybrids
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	10.7	0
Market pricing | Corporates
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Technique	Market Pricing
Broker-quoted | Asset-backed securities
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	5.0	15.9
Broker-quoted | Commercial mortgage-backed securities
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	5.7	5.0
Broker-quoted | Corporates
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Technique	Broker-quoted
Assets, Fair Value Disclosure	404.5	103.3
Broker-quoted | Hybrids
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Technique	Broker-quoted
Market pricing | Corporates
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	56.6	32.0
Market pricing | Hybrids
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
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Assets, Fair Value Disclosure	41.0	41.0
Contingent purchase price reduction receivable | Discounted cash flow
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Technique	Discounted cash flow
FIA embedded derivatives, included in contractholder funds
Liabilities
Liabilities, Fair Value Disclosure	1,544.4	1,550.8
FIA embedded derivatives, included in contractholder funds | Discounted cash flow
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Technique	Discounted cash flow
Equity conversion feature of preferred stock
Liabilities
Liabilities, Fair Value Disclosure	$ 330.8	$ 232.0
Equity conversion feature of preferred stock | Monte Carlo simulation / Option model
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Valuation Technique	Monte Carlo simulation / Option model
Minimum | Asset-backed securities
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Offered quotes	100.00%	100.00%
Minimum | Corporates
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Quoted prices	0.00%	0.00%
Offered quotes	90.00%	88.00%
Minimum | Hybrids
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Quoted prices		0.00%
Minimum | Contingent purchase price reduction receivable
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Probability of collection	88.00%	88.00%
Minimum | FIA embedded derivatives, included in contractholder funds
Liabilities
Market value of option	0.00%	0.00%
SWAP rates	2.00%	0.76%
Surrender rates	0.50%	2.00%
Non-performance spread	0.25%	0.25%
Minimum | Equity conversion feature of preferred stock
Liabilities
Annualized volatility of equity
Discount yield		12.00%
Calibration adjustment	0.00%	10.00%
Maximum | Asset-backed securities
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Offered quotes	107.00%	110.00%
Maximum | Commercial mortgage-backed securities
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Offered quotes		101.00%
Maximum | Corporates
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Quoted prices	131.00%	141.00%
Offered quotes	113.00%	158.00%
Maximum | Hybrids
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Quoted prices		103.00%
Maximum | Contingent purchase price reduction receivable
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	1.00%	0.72%
Credit insurance risk premium	11.00%	12.00%
Maximum | FIA embedded derivatives, included in contractholder funds
Liabilities
Market value of option	38.00%	31.00%
SWAP rates	3.00%	2.00%
Mortality multiplier
Surrender rates	75.00%	50.00%
Non-performance spread	0.25%	0.25%
Maximum | Equity conversion feature of preferred stock
Liabilities
Discount yield		13.00%
Non-cash accretion rate	0.00%	0.00%
Calibration adjustment	1.00%	13.00%
Weighted average
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Risk-free discount factor	0.999
Risk-adjusted discount factor	0.995
Upward movement factor (Mu)	1.1
Downward movement (Md)	0.9
Probability of upward movement (Pu)	48.60%
Probability of downward movement (Pd)	51.40%
Weighted average | Asset-backed securities
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Offered quotes	101.00%	103.00%
Weighted average | Commercial mortgage-backed securities
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Offered quotes	96.00%
Weighted average | Corporates
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Quoted prices	90.00%	69.00%
Offered quotes	97.00%	98.00%
Weighted average | Hybrids
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Quoted prices		25.00%
Offered quotes	25.00%
Weighted average | Contingent purchase price reduction receivable
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Probability of collection	92.00%	92.00%
Weighted average | FIA embedded derivatives, included in contractholder funds
Liabilities
Market value of option	4.00%	4.00%
SWAP rates	2.00%	1.00%
Mortality multiplier	80.00%	70.00%
Surrender rates	7.00%	7.00%
Non-performance spread	0.25%	0.25%
Weighted average | Equity conversion feature of preferred stock
Liabilities
Annualized volatility of equity	42.00%	41.00%
Discount yield	11.00%	12.00%
Calibration adjustment	0.30%	11.00%

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Fair Value Inputs, Downward Movement

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Fair value inputs market value of option.

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Fair Value Inputs, Probability of Downward Movement

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Fair Value Inputs, Probability of Upward Movement

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Fair Value Inputs, Risk-adjusted Discount Factor

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Fair Value Inputs, Risk-free Discount Factor

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Fair Value Inputs, Upward Movement

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Fair value measurements annualized volatility of equity.

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Fair value measurements calibration adjustment.

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- Definition

Credit insurance risk premium.

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Discount yield.

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Mortality multiplier.

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Non-cash accretion rate.

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Non-performance spread.

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Offered quotes.

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Fair value measurements probability of collection.

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Fair value measurements quoted prices.

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Surrender rates.

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Fair value measurements swap rates.

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ 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)

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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.

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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.

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Description of the inputs and valuation technique(s) used to measure fair value.

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Fair value of financial and nonfinancial obligations.

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-Topic 820

-SubTopic 10

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