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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, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Earnings Per Share [Abstract]                      
Income from continuing operations $ 17.4 [1] $ 15.8 $ 18.2 [2] $ 14.4 $ 19.9 [3] $ 15.0 $ 16.9 $ 7.9 $ 65.8 $ 59.7 $ 152.5
(Loss) gain from discontinued operations and disposal, net of tax (5.9) 3.0 0.1 0.5 3.9 0.4 0.2 (0.5) (2.3) 4.0 7.5
Net income $ 11.5 $ 18.8 $ 18.3 $ 14.9 $ 23.8 $ 15.4 $ 17.1 $ 7.4 $ 63.5 $ 63.7 $ 160.0
Weighted average shares outstanding - basic (shares)                 62.2 62.7 62.6
Dilutive effect of common stock equivalents (shares)                 1.2 0.9 0.6
Weighted average shares outstanding - Diluted (shares)                 63.4 63.6 63.2
Basic earnings per share:                      
Earnings from continuing operations (usd per share)                 $ 1.06 $ 0.95 $ 2.44
(Loss) gain from discontinued operations and disposal, net of tax                 (0.04) 0.06 0.12
Net earnings per share (usd per share)                 1.02 1.01 2.56
Diluted earnings per share:                      
Earnings from continuing operations (usd per share) $ 0.27 $ 0.25 $ 0.29 $ 0.22 $ 0.31 $ 0.23 $ 0.27 $ 0.13 1.04 0.94 2.41
Loss (gain) from discontinued operations and disposal, net of tax (usd per share) (0.09) 0.05 0.00 0.01 0.06 0.01 0.00 (0.01) (0.04) 0.06 0.12
Net earnings per share (usd per share) $ 0.18 $ 0.30 $ 0.29 $ 0.23 $ 0.37 $ 0.24 $ 0.27 $ 0.12 $ 1.00 $ 1.00 $ 2.53
[1] Income from continuing operations includes a $1.4 million net benefit from special tax items, comprised of a $4.2 million net tax benefit associated with tax planning strategies, offset by a $2.4 million adjustment of deferred tax assets and $0.4 million of expense associated with a change in the enacted tax rate in the U.K. Gain (loss) from discontinued operations and disposal, net includes tax expense of $6.3 million associated with recognizing a net deferred tax liability for the outside basis differences of entities being sold as part of the sale of Bronto.
[2] (a)
[3] Income from continuing operations includes a tax benefit of $3.5 million relating to the release of valuation allowance previously recorded against the Company’s foreign deferred tax assets.