Schedule of Property Plant and Equipment (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 25, 2011
Property, Plant and Equipment [Line Items]
Land and improvements	$ 24.7	$ 24.0
Buildings and improvements	391.9	382.4
Machinery and equipment	1,769.5	1,732.0
Construction in progress	140.5	151.5
Total property, plant and equipment	2,326.6	2,289.9
Less accumulated depreciation	1,551.4	1,524.5
Property, plant and equipment	$ 775.2	$ 765.4

The cumulative amount of depreciation, depletion and amortization (related to property, plant and equipment, but not including land) that has been recognized in the income statement.

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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Gross amount, at the balance sheet date, of long-lived assets under construction that include construction costs to date on capital projects that have not been completed and assets being constructed that are not ready to be placed into service.

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Carrying amount as of the balance sheet date of real estate held for productive use. This excludes land held for sale.

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Gross amount, as of the balance sheet date, of long-lived, depreciable assets used in the production process to produce goods and services.

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Gross amount of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount, net of accumulated depreciation, depletion and amortization, of long-lived physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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