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Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended	9 Months Ended		12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Jun. 18, 2011 M	Sep. 30, 2012	Sep. 30, 2011	Dec. 28, 2011 M	Dec. 31, 2011 Contract
Number of reinsurance contracts							2
Coverage amount			$ 100			$ 100
Coverage period, months			18			24
Other reinsurance-related expenses	7.0	2.7		20.8	3.1
Other assets	$ 6.4			$ 6.4			$ 9.0

Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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