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Depreciation and Interest Charges on Property, Plant and Equipment (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jul. 01, 2011	Jun. 30, 2012	Jul. 01, 2011
Property, Plant and Equipment [Line Items]
Depreciation and amortization on PP&E	$ 13.7	$ 13.0	$ 26.5	$ 25.6
Interest charges capitalized (in construction in progress)	$ 0.3	$ 0.4	$ 0.6	$ 0.7

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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