Amortized cost of investments with other than temporary impairments.

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- Definition

Available for sale depressed securities fair value disclosure.

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- Definition

Available for sale securities on fixed maturity under commitment agreement.

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- Definition

Equity Investment Ownership Percentage

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- Definition

Exposure to sub prime and alternative A residential mortgage backed securities.

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- Definition

Fair value of investments with other than temporary impairments.

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- Definition

Industry Holdings, Number of Top Investments

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- Definition

Investment exposure to sub prime.

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Investment percentage exposure to sub prime.

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- Definition

Non Credit Related Losses Recognized In Other Comprehensive Income

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- Definition

Number of investment issuers.

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- Definition

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

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- Definition

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

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Other Than Temporary Impairment Credit Losses Recognized In Earnings Additions Other

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- Definition

Percentage of available for sale depressed securities above amortized cost.

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- Definition

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

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- Definition

Percentage of investment in industry relation to aggregate holdings in industry.

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- Definition

Percentage of investments fair value in relation to invested assets portfolio.

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- Definition

Significant Investment, Number of Industries

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- Definition

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

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- Definition

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

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

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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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This item represents the gross unrealized losses for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

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-Name Regulation S-X (SX)

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-Section 03

-Paragraph 1

-Subparagraph a, f, g

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All other marketable securities, which aren't categorized as trading, available-for-sale, or held-to-maturity and which are not otherwise listed in the existing taxonomy, intended to be held for less than one year or the normal operating cycle, whichever is longer.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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-Name Regulation S-X (SX)

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-Section 02

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-Article 5

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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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Investments - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013 Investment industry	Apr. 01, 2012	Mar. 31, 2013 Investment industry	Apr. 01, 2012	Sep. 30, 2012	Jan. 01, 2012
Schedule of Available-for-sale Securities [Line Items]
Unrealized losses included in AOCI related to the non-credit portion of other-than-temporary impairments on non-agency residiential-mortgage-backed securities	$ 19.9		$ 19.9		$ 30.6
Other than temporary impairment credit losses recognized in earnings additions other	0.4	4.1	0.9	17.3
Credit losses in operations, including credit impairments	0.1		0.3
Credit losses in operations, change of intent operations	0.3	1.6	0.7	14.7
Amortized cost on other-than temporary impairments	2.7		2.7			86.9
Fair value on other than temporary impairments	1.8		1.8			68.0
Change-of-intent, and non-credit losses in other comprehensive income		2.6		2.6
Other than temporary impairment losses, available-for-sale securities	0.4	4.1	0.9	17.3
Significant investment, number of industries	1		1
Industry holdings, number of top investments	10		10
Non-agency residential mortgage-backed securities [Member]
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		0.9		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		1.9		1.9
Fair value of securities held on deposit	20.4		20.4		20.7
FGL [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of investment	2,036.4		2,036.4
Percentage of fair value of the invested assets portfolio	12.20%		12.20%
Investment in issuers	87		87
Percentage of investment accounting	39.60%		39.60%
FGL's exposure to sub-prime	332.3		332.3
FGL's exposure to Alternative-A residential mortgage-backed securities	328.6		328.6
Percentage of FGL's exposure to sub-prime to invested assets	2.00%		2.00%
FGL [Member] \| Stockholders' Equity, Total [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of investment	1,408.0		1,408.0		1,625.9
Percentage of fair value of the invested assets portfolio	8.40%		8.40%		9.80%
Investment in issuers	10		10		13
Percentage of stockholders equity	10.00%		10.00%
Net Investment Income [Member]
Schedule of Available-for-sale Securities [Line Items]
Available for sale securities on fixed maturity	2,490.4	1,417.0	4,905.5	3,150.1
Gross gains on available-for-sale securities	71.0	70.1	249.0	162.4
Gross losses on available-for-sale securities	0.1	1.2	0.6	11.7
Concentration [Member] \| FGL [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value of investment	167.7		167.7		152.9
Percentage of fair value of the invested assets portfolio	1.00%		1.00%		0.70%
Insurance and Financial Services [Member]
Schedule of Available-for-sale Securities [Line Items]
Fair value on securities	$ 0.1		$ 0.1		$ 1.2
Percentage of amortized cost			20.00%
Percentage of carrying values of all investments (less than 1%)			1.00%