Investments - Net Investment Gains (Losses) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
Mar. 31, 2013	Apr. 01, 2012	Mar. 31, 2013	Apr. 01, 2012
Net Investment Gains (Losses)
Net realized gains before other-than-temporary impairments	$ 73.0	$ 69.7	$ 245.5	$ 151.6
Gross other-than-temporary impairments	(0.4)	(4.8)	(0.9)	(18.9)
Non-credit portion of other-than-temporary impairments included in other comprehensive income		0.7		1.6
Net realized gains on fixed maturity available-for-sale securities	72.6	65.6	244.6	134.3
Realized gains on equity securities	1.9	0.1	1.9	0.4
Net realized gains on securities	74.5	65.7	246.5	134.7
Realized gains (losses) on certain derivative instruments	29.7	9.8	45.3	(5.7)
Unrealized gains on certain derivative instruments	102.5	89.2	61.3	139.5
Change in fair value of derivatives	132.2	99.0	106.6	133.8
Realized gains on other invested assets		(1.1)	0.1	(1.0)
Net investment gains	$ 206.7	$ 163.6	$ 353.2	$ 267.5

Change in fair value of derivatives.

No definition available.

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- Definition

Gain loss on sale of available for sale securities.

+ References

No definition available.

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- Definition

Gain loss on sale of equity securities.

+ References

No definition available.

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- Definition

NonCreditPortion of other-than-temporary impairments included in other comprehensive incomeOffset

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No definition available.

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- Definition

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any gains (losses) realized during the period from the sale of investments accounted for under the cost method of accounting and losses recognized for other than temporary impairments (OTTI) of the subject investments.

+ References

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- Definition

The difference between the book value and the sale price of options, swaps, futures, forward contracts, and other derivative instruments. This element refers to the gain (loss) included in earnings.

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- Definition

The difference between the book value and the sale price of other nonspecific investments. This element is used when other, more specific, elements are not appropriate. This element refers to the gain (loss) included in earnings.

+ References

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- Definition

The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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- Definition

The amount by which the fair value of an investment 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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- Definition

This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity.

+ References

No definition available.

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- Definition

The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

+ References

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