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Summary of Changes in Fair Value of Plan's Level Three Assets (Detail) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Level 3
Changes In Level 3 Assets And Liabilities Measured At Fair Value On Recurring Basis [Line Items]
Beginning Balance	$ 167.6	$ 133.0	$ 9.7
Return on plan assets related to assets held as the end of the period			0.8
Return on plan assets related to assets sold during the period
Purchases (sales), net			1.6
Ending Balance	$ 167.6	$ 133.0	$ 12.1

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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