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Available for sale depressed securities fair value disclosure.

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Available for sale securities on fixed maturity under commitment agreement.

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Percentage of the total commercial loan portfolio.

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Percentage that investment represents of the total investments by the entity.

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Percentage of performing loans to total loan portfolio.

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Highest loan to value ratio present in the loan portfolio.

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Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Including Credit Impairments

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Percentage of available for sale depressed securities above amortized cost.

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Percentage of available for sale depressed securities in relation to carrying values of all investments.

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Unrealized gain related to non credit portion of other than temporary impairments included in accumulated other comprehensive income.

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Unrealized losses related to non credit portion of other than temporary impairments included in accumulated other comprehensive income.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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-Section S99

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-Subparagraph (SX 210.5-02.2)

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- Definition

This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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- Definition

The increase (decrease) in the allowance for credit losses related to financing receivables.

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Amount of direct write-downs of financing receivables charged against the allowance.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

Recorded Investment in financing receivables that are past due at the balance sheet date.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

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- Definition

Amount before allowance of mortgage loans on existing land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

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- Definition

Amount of other investments not classified as trading, available-for-sale or held-to-maturity, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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This item represents reductions in the amount of cumulative losses recognized in earnings for other than temporary impairments (OTTI) for which a portion of the impairment had been recognized in other comprehensive income (a component of shareholders' equity) due to a change in status of the impaired security because of a change in the entity's intent to either sell the impaired security or it has become more likely than not that the entity will be required to sell the security before recovery of its cost basis.

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The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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Investments - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Financing Receivable, Impaired [Line Items]
Mortgage Loans on Real Estate, Commercial and Consumer, Net	$ 489.2	$ 136.2
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Reductions, Change in Status	10.0
Loans Receivable, Gross, Commercial, Mortgage	$ 490.0	$ 136.2
Commercial Mortgage Receivable, Percentage of Total	100.00%	100.00%
Total asset-based loans	$ 395.9	$ 818.8
Financing Receivable, Allowance for Credit Losses, Write-downs			$ 0.0
Provision for credit losses	129.5	2.0	3.8
Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net, Available-for-sale Securities	30.1	0.7	2.9
Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Including Credit Impairments	(20.0)
Long-term debt	6,408.4	5,194.5
Financing Receivable, Recorded Investment, Past Due	490.0	136.2
Financing Receivable, Allowance for Credit Losses, Period Increase (Decrease)	(52.9)
Non-agency residential mortgage-backed securities
Financing Receivable, Impaired [Line Items]
Unrealized gains included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities	0.9
Unrealized losses included in AOCI related to the non-credit portion of other than-temporary impairments on non-agency residential-mortgage-backed securities	(1.9)
Securities held on deposit with various state regulatory authorities, fair value	16,012.3	15,009.3
Asset Backed Securities and Corporate Securities [Member]
Financing Receivable, Impaired [Line Items]
Available-for-sale Securities, Amortized Cost Basis	268.0
Available-for-sale Securities	238.0
Net Investment Income
Financing Receivable, Impaired [Line Items]
Available For Sale Securities On Fixed Maturity Under Commitment Agreement	4,776.6	5,033.4	8,986.9
Available-for-sale Securities, Gross Realized Gains	83.3	108.5	351.2
Available-for-sale Securities, Gross Realized Losses	72.5	4.9	$ 18.3
Insurance Segment [Member]
Financing Receivable, Impaired [Line Items]
Fair value on securities	$ 302.1	0.2
Percentage of amortized cost	20.00%
Percentage of carrying values of all investments (less than 1%)	2.00%
Radioshack [Member] \| Insurance Segment [Member]
Financing Receivable, Impaired [Line Items]
Long-term debt	$ 57.0
Radioshack [Member] \| Asset Management segment [Member]
Financing Receivable, Impaired [Line Items]
Long-term debt	93.0
Financing Receivables, 1 to 29 Days Past Due [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Recorded Investment, Past Due	490.0	$ 136.2
Salus Capital Partners LLC \| Radioshack [Member]
Financing Receivable, Impaired [Line Items]
Long-term debt	250.0
Radioshack [Member]
Financing Receivable, Impaired [Line Items]
Financing Receivable, Allowance for Credit Losses, Write-downs	76.6
Provision for credit losses	24.8
Radioshack [Member] \| Non-Qualifying Participation [Member]
Financing Receivable, Impaired [Line Items]
Long-term debt	$ 100.0
Commercial Mortgage Loan [Member]
Financing Receivable, Impaired [Line Items]
Investments, Cost or Amortized, Percentage of Total	2.60%	0.70%
Loan to Value, Maximum Threshold	100.00%
Loans and Leases Receivable, Ratio of Performing Loans to All Loans	75.00%