Earnings (Loss) Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Schedule Of Computation Of Basic And Diluted Earnings Per Common Share [Line Items]
Income (loss) from continuing operations	$ (1.1)	$ 3.1
Gain (loss) from discontinued operations and disposal, net of tax	0.5	(4.2)
Net loss	$ (0.6)	$ (1.1)
Weighted average shares outstanding - Basic	62.4	62.2
Dilutive effect of common stock equivalents
Weighted average shares outstanding - Diluted	62.4	62.2
Basic loss per share:
Income (loss) from continuing operations	$ (0.02)	$ 0.05
Gain (loss) from discontinued operations and disposal, net of tax	$ 0.01	$ (0.07)
Net loss per share	$ (0.01)	$ (0.02)
Diluted loss per share:
Income (loss) from continuing operations	$ (0.02)	$ 0.05
Gain (loss) from discontinued operations and disposal, net of tax	$ 0.01	$ (0.07)
Net loss per share	$ (0.01)	$ (0.02)

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Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

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