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Postretirement Benefit Plans - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012
Remeasurement of projected benefit obligations and plan assets	$ 41.2
Defined benefit plan accumulated other comprehensive income unrecognized actuarial loss before tax	8.8
Net postretirement liability	294.9
Unrecognized actuarial loss	959.8
Curtailment loss	4.9
Income from discontinued operations	3.6
U.S. Pension Plans [Member]
Contributions made to pension plans	$ 33.1

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Defined benefit plan accumulated other comprehensive income unrecognized actuarial loss before tax.

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Increase (decrease) in pension plan funding status

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The increase in the fair value of plan assets from contributions made by the employer.

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The amount of decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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Before tax amount of the (increase) decrease in the value of the projected benefit obligation and the increase (decrease) in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost.

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This represents the entire liability recognized in the balance sheet that is associated with the defined benefit plans.

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