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Postretirement Benefit Plans - Changes in Fair Value of Plan Assets of Other Employee-Related Defined Benefit Plan Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Change in plan assets
Plan assets - January 1	$ 191.8
Employer contributions	71.0	30.8
Plan assets - December 31	257.0	191.8
Funded status at end of year	(343.0)	(330.1)
Others Benefits [Member]
Change in plan assets
Plan assets - January 1	7.5	7.8
Actual return on plan assets	0.4	(0.3)
Employer contributions	9.7	9.4
Benefits paid	(9.7)	(9.4)
Plan assets - December 31	7.9	7.5
Funded status at end of year	$ (205.1)	$ (184.3)

X

- Definition

The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

+ References

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-Publisher FASB

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Pension Cost)

-URI http://asc.fasb.org/extlink&oid=6504226



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-Publisher FASB

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X

- Definition

The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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- Definition

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

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- Definition

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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- Definition

The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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