Reconciliation of Net Income (Loss) to Basic and Diluted EPS (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Income from continuing operations	$ 7.6	$ (1.1)
(Loss) gain from discontinued operations and disposal, net of tax	(0.2)	0.5
Net income (loss)	$ 7.4	$ (0.6)
Weighted average shares outstanding - Basic (shares)	62.8	62.4
Dilutive effect of common stock equivalents (shares)	0.9	0
Weighted average shares outstanding - Diluted (shares)	63.7	62.4
Basic earnings (loss) per share:
Earnings from continuing operations (usd per share)	$ 0.12	$ (0.02)
Loss from discontinued operations and disposal, net of tax (usd per share)	$ 0.00	$ 0.01
Net earnings (loss) per share (usd per share)	$ 0.12	$ (0.01)
Diluted earnings (loss) per share:
Earnings from continuing operations (usd per share)	$ 0.12	$ (0.02)
Loss from discontinued operations and disposal, net of tax (usd per share)	$ 0.00	$ 0.01
Net earnings (loss) per share (usd per share)	$ 0.12	$ (0.01)