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Computation of Earnings (Loss) Per Common Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Earnings Per Share [Abstract]                      
Income from continuing operations $ 12.1 $ 7.5 $ 9.4 [1] $ 10.4 $ 17.4 $ 15.8 $ 18.2 $ 14.4 $ 39.4 $ 65.8 $ 59.7
Gain (loss) from discontinued operations and disposal, net of tax 0.5 1.0 (0.3) 3.2 (5.9) 3.0 0.1 0.5 4.4 (2.3) 4.0
Net income $ 12.6 $ 8.5 $ 9.1 $ 13.6 $ 11.5 $ 18.8 $ 18.3 $ 14.9 $ 43.8 $ 63.5 $ 63.7
Weighted average shares outstanding - basic (shares)                 60.4 62.2 62.7
Dilutive effect of common stock equivalents (shares)                 0.8 1.2 0.9
Weighted average shares outstanding - Diluted (shares)                 61.2 63.4 63.6
Basic earnings per share:                      
Earnings from continuing operations (usd per share)                 $ 0.65 $ 1.06 $ 0.95
Earnings (loss) from discontinued operations and disposal, net of tax                 0.07 (0.04) 0.06
Net earnings per share (usd per share)                 0.72 1.02 1.01
Diluted earnings per share:                      
Earnings from continuing operations (usd per share) $ 0.20 $ 0.12 $ 0.15 $ 0.17 $ 0.27 $ 0.25 $ 0.29 $ 0.22 0.64 1.04 0.94
Loss (gain) from discontinued operations and disposal, net of tax (usd per share) 0.01 0.02 0.00 0.05 (0.09) 0.05 0.00 0.01 0.07 (0.04) 0.06
Net earnings per share (usd per share) $ 0.21 $ 0.14 $ 0.15 $ 0.22 $ 0.18 $ 0.30 $ 0.29 $ 0.23 $ 0.71 $ 1.00 $ 1.00
[1] (a)