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Financial Instruments - Net Investment Hedge Derivative Instruments on OCI (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Euro-denominated revolving credit facilities [Member]
Derivative [Line Items]
Amount of (Loss) Gain Recognized in OCI on Derivative (Effective Portion)	$ 0	$ (0.2)	$ 8.6
Canadian dollar-denominated revolving credit facilities [Member]
Derivative [Line Items]
Amount of (Loss) Gain Recognized in OCI on Derivative (Effective Portion)	$ 0	$ (0.4)	$ (5.6)

Current period adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect.

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