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Depreciation and Interest Charges on Property, Plant and Equipment (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property, Plant and Equipment [Line Items]
Depreciation and amortization on PP&E	$ 56.0	$ 49.8	$ 44.1
Interest charges capitalized (in construction in progress)	$ 0.8	$ 1.9	$ 1.0

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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