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Earnings Per Share - Basic and Diluted Loss Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Calculation Of Numerator And Denominator In Earnings Per Share [Line Items]
Income (loss) from continuing operations	$ 60.8	$ (29.5)	$ 87.7	$ (32.3)
Weighted average common shares outstanding	92.3	92.2	92.9	92.0
Add: Weighted average restricted stock awards outstanding(a)	0.2	0.5	0.3	0.6
Basic weighted average common shares outstanding	92.5	92.7	93.2	92.6
Add: Dilutive impact of stock options	1.0		1.1
Diluted weighted average common shares outstanding	93.5	92.7	94.3	92.6
Basic earnings (loss) per share from continuing operations	$ 0.66	$ (0.32)	$ 0.94	$ (0.35)
Diluted earnings (loss) per share from continuing operations	$ 0.65	$ (0.32)	$ 0.93	$ (0.35)

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