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Property, Plant and Equipment - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Property Plant And Equipment [Line Items]
Book value of assets held for sale	$ 24.1		$ 19.2
Depreciation expense	$ 88.5	$ 95.4

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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