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Reconciliation of Net Income (Loss) to Basic and Diluted EPS (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Earnings Per Share [Abstract]        
Income from continuing operations $ 18.3 $ 17.0 $ 33.2 $ 24.6
Gain (loss) from discontinued operations and disposal, net of tax 0.0 0.1 0.0 (0.1)
Net income $ 18.3 $ 17.1 $ 33.2 $ 24.5
Weighted average shares outstanding - Basic (shares) 62.6 62.8 62.5 62.8
Dilutive effect of common stock equivalents (shares) 1.0 1.0 1.0 1.0
Weighted average shares outstanding - Diluted (shares) 63.6 63.8 63.5 63.8
Basic earnings per share:        
Earnings from continuing operations (usd per share) $ 0.29 $ 0.27 $ 0.53 $ 0.39
Gain (loss) from discontinued operations and disposal, net of tax (usd per share) 0.00 0.00 0.00 0.00
Net earnings per share (usd per share) 0.29 0.27 0.53 0.39
Diluted earnings per share:        
Earnings from continuing operations (usd per share) 0.29 0.27 0.52 0.39
Gain (loss) from discontinued operations and disposal, net of tax (usd per share) 0.00 0.00 0.00 0.00
Net earnings per share (usd per share) $ 0.29 $ 0.27 $ 0.52 $ 0.39