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Basic and Diluted (Loss) Earnings Per Common Share - Components of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Restructuring charges	$ 20.7		$ (0.3)
Non cash benefit due to release of deferred tax valuation allowance	15.8	16.9	260.6
2012 Restructuring Program [Member]
Restructuring charges	24.1
Litigation Related to 2009 Exchange Offer [Member]
Charge for the estimated costs of resolving litigation	$ 8.9

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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