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Allocation of Plan Assets, Postretirement Benefit Plan (Detail) (Other Postretirement Benefit Plans, Defined Benefit, USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	$ 187.1	$ 174.7	$ 191.9
Fair Value, Inputs, Level 2
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	187.1	174.7
Fair Value, Inputs, Level 2 \| Cash and Cash Equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	8.4	17.7
Fair Value, Inputs, Level 2 \| Equity Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	133.3	114.3
Fair Value, Inputs, Level 2 \| Fixed Income Funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	35.9	42.7
Fair Value, Inputs, Level 2 \| Derivative
Defined Benefit Plan Disclosure [Line Items]
Fair value of the company's benefit plan assets	$ 9.5

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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