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Activity for Level Three Pension Plan Assets (Detail) (USD $) In Millions, unless otherwise specified							12 Months Ended
	Dec. 31, 2012 Pension Benefits, Domestic	Dec. 31, 2011 Pension Benefits, Domestic	Dec. 31, 2010 Pension Benefits, Domestic	Dec. 31, 2012 Pension Benefits, Foreign	Dec. 31, 2011 Pension Benefits, Foreign	Dec. 31, 2010 Pension Benefits, Foreign	Dec. 31, 2012 Level 3 Pension Benefits, Domestic	Dec. 31, 2011 Level 3 Pension Benefits, Domestic	Dec. 31, 2012 Level 3 Pension Benefits, Foreign	Dec. 31, 2011 Level 3 Pension Benefits, Foreign
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 256.5	$ 234.6	$ 221.6	$ 33.5	$ 30.2	$ 29.3	$ 13.3	$ 15.0	$ 15.3	$ 15.3
Relating to assets held at year-end							1.3	(0.2)	0.6	0.5
Relating to assets sold during the period							(0.3)
Purchases, sales, settlements and other, net							(0.2)	8.3	0.3	(0.5)
Transfers in/(out)								(9.8)
Fair value of plan assets at end of year	$ 256.5	$ 234.6	$ 221.6	$ 33.5	$ 30.2	$ 29.3	$ 14.1	$ 13.3	$ 16.2	$ 15.3

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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