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Changes in Fair Value of Level Three Assets (Detail) (Fair Value, Inputs, Level 3, Private Equity Funds, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Inputs, Level 3 \| Private Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 30.1	$ 15.5
Unrealized gains/losses-net	5.8	3.2
Purchases, sales and settlements	3.0	11.4
Fair value of plan assets at end of year	$ 38.9	$ 30.1

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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