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Earnings Per Share - Basic and Diluted Loss Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Income (loss) from continuing operations	$ 109.5	$ (576.5)	$ (130.4)
Weighted average common shares outstanding	92.7	92.2	91.2
Add: Weighted average restricted stock awards outstanding	0.3	0.6	0.8
Basic weighted average common shares outstanding	93.0	92.8	92.0
Add: Dilutive impact of stock options	1.1
Diluted weighted average common shares outstanding	94.1	92.8	92.0
Basic earnings (loss) per share	$ 1.18	$ (6.22)	$ (1.42)
Diluted earnings (loss) per share	$ 1.16	$ (6.22)	$ (1.42)

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