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Reconciliation of Net Income (Loss) to Basic and Diluted EPS (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]
Income from continuing operations	$ 15.2	$ 16.8	$ 39.8	$ 133.5
Gain (loss) from discontinued operations and disposal, net of tax	0.2	(0.8)	0.1	(0.6)
Net income	$ 15.4	$ 16.0	$ 39.9	$ 132.9
Weighted average shares outstanding - Basic (shares)	62.7	62.6	62.8	62.5
Dilutive effect of common stock equivalents (shares)	1.1	0.6	1.0	0.5
Weighted average shares outstanding - Diluted (shares)	63.8	63.2	63.8	63.0
Basic earnings per share:
Earnings from continuing operations (usd per share)	$ 0.24	$ 0.27	$ 0.63	$ 2.14
Gain (loss) from discontinued operations and disposal, net of tax (usd per share)	$ 0.00	$ (0.01)	$ 0.00	$ (0.01)
Net earnings per share (usd per share)	$ 0.24	$ 0.26	$ 0.63	$ 2.13
Diluted earnings per share:
Earnings from continuing operations (usd per share)	$ 0.24	$ 0.26	$ 0.62	$ 2.12
Gain (loss) from discontinued operations and disposal, net of tax (usd per share)	$ 0.00	$ (0.01)	$ 0.00	$ (0.01)
Net earnings per share (usd per share)	$ 0.24	$ 0.25	$ 0.62	$ 2.11

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