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Discontinued Operations - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Sep. 30, 2012	Dec. 31, 2011
Restructuring Cost and Reserve [Line Items]
Costs related to closure		$ 41.0
Estimated total future closure costs	1.0
Future completion period, closure	2014
Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Costs related to closure		20.8
Depreciation And Amortization [Member]
Restructuring Cost and Reserve [Line Items]
Costs related to closure		$ 20.2

The charge against earnings in the period, comprised of costs incurred associated with an exit or disposal activity other than for a discontinued operations as defined under generally accepted accounting principles. Costs of such activities include those for one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and costs associated with an ongoing benefit arrangement, but excludes costs associated with the retirement of a long-lived asset.

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- Definition

Amount expected to be charged against earnings in the current and future periods for the specified restructuring cost.

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