Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Schedule of Available-for-sale Securities [Line Items]
Gross Unrealized Losses	$ (263.9)	$ (30.6)
Treasury Yield	2.64%	1.63%
Other than temporary impairment credit losses recognized in earnings additions other	2.9	22.8
Credit losses in operations, including credit impairments	0.8	5.7	5.1
Credit losses in operations, change of intent operations	2.2	17.1	12.9
Amortized cost on other-than temporary impairments	9.6	162.3	103.3
Fair value on other than temporary impairments	6.7	138.0	85.8
Change-of-intent, and non-credit losses in other comprehensive income		1.5	0.5
Total other-than-temporary impairments	2.9	22.8	18.0
Other-than-temporary impairments, available-for-sale securities	2.9	22.8	18.0
Non-agency residential mortgage-backed securities
Schedule of Available-for-sale Securities [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	19.4	20.7
Gross Unrealized Losses	(13.4)	(4.3)
Total other-than-temporary impairments	1.2	7.5	5.1
Net Investment Income
Schedule of Available-for-sale Securities [Line Items]
Proceeds from sale of fixed maturity available-for-sale securities	8,986.9	4,603.0	1,804.0
Gross realized gains on sale of available-for-sale securities	351.2	295.9	42.0
Gross realized losses on sale of available-for-sale securities	18.3	13.8	17.1
Insurance and Financial Services
Schedule of Available-for-sale Securities [Line Items]
Fair value on securities	$ 60.9	$ 1.2
Percentage of amortized cost	20.00%
Percentage of carrying values of all investments (less than 1%)	1.00%

Amortized cost of investments with other than temporary impairments.

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Available for sale depressed securities fair value disclosure.

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Available for sale securities gross unrealized losses investment.

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Available for sale securities on fixed maturity under commitment agreement.

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Fair value of investments with other than temporary impairments.

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Non Credit Related Losses Recognized In Other Comprehensive Income

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Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Change Of Intent Operations

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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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Treasury Yield

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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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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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-Publisher FASB

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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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The amount by which the fair value of an investment in debt and equity securities categorized as Available-for-sale is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

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