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Earnings Per Share - Computation of Earnings (Loss) Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
 [6]
Sep. 30, 2016
 [6]
Jun. 30, 2016
 [6]
Mar. 31, 2016
 [6]
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]                      
Income from continuing operations $ 29.3 [1] $ 12.5 [2] $ 11.5 [3] $ 7.2 [4] $ 12.1 [5] $ 7.5 [7] $ 9.4 [8] $ 10.4 [9] $ 60.5 $ 39.4 $ 65.8
Gain (loss) from discontinued operations and disposal, net of tax 1.1 0.0 (0.1) 0.1 0.5 1.0 (0.3) 3.2 1.1 4.4 (2.3)
Net income $ 30.4 $ 12.5 $ 11.4 $ 7.3 $ 12.6 $ 8.5 $ 9.1 $ 13.6 $ 61.6 $ 43.8 $ 63.5
Weighted average shares outstanding - basic (shares)                 59.7 60.4 62.2
Dilutive effect of common stock equivalents (shares)                 0.7 0.8 1.2
Weighted average shares outstanding - Diluted (shares)                 60.4 61.2 63.4
Basic earnings per share:                      
Earnings from continuing operations (usd per share)                 $ 1.01 $ 0.65 $ 1.06
Earnings (loss) from discontinued operations and disposal, net of tax (usd per share)                 0.02 0.07 (0.04)
Net earnings per share (usd per share)                 1.03 0.72 1.02
Diluted earnings per share:                      
Earnings from continuing operations (usd per share) $ 0.48 $ 0.21 $ 0.19 $ 0.12 $ 0.20 $ 0.12 $ 0.15 $ 0.17 1.00 0.64 1.04
Earnings (loss) from discontinued operations and disposal, net of tax (usd per share) 0.02 0.00 0.00 0.00 0.01 0.02 0.00 0.05 0.02 0.07 (0.04)
Net earnings per share (usd per share) $ 0.50 $ 0.21 $ 0.19 $ 0.12 $ 0.21 $ 0.14 $ 0.15 $ 0.22 $ 1.02 $ 0.71 $ 1.00
[1] Income from continuing operations includes purchase accounting expenses, acquisition and integration-related expenses, restructuring charges, pension settlement charges and hearing loss settlement charges of $0.5 million, $0.5 million, $0.1 million, $6.1 million and $1.5 million, respectively, as well as a $20.8 million net benefit from special tax items, primarily represented by the Company’s preliminary estimate of the impact of the 2017 Tax Act, including the effect of the reduction in the corporate tax rate in the U.S.
[2] Income from continuing operations includes purchase accounting expenses, acquisition and integration-related expenses, and restructuring charges of $1.3 million, $0.7 million and $0.1 million, respectively, as well as $0.6 million of tax expense associated with a change in the enacted state tax rate in Illinois.
[3] Income from continuing operations includes purchase accounting expenses, acquisition and integration-related expenses, and restructuring charges of $2.5 million, $1.0 million and $0.1 million, respectively.
[4] Income from continuing operations includes purchase accounting expenses, acquisition and integration-related expenses, restructuring charges and executive severance costs of $0.5 million, $0.5 million, $0.3 million and $0.7 million, respectively.
[5] Income from continuing operations includes purchase accounting expenses, acquisition and integration-related expenses and restructuring charges of $0.9 million, $0.2 million and $0.1 million, respectively, as well as a $2.2 million net benefit resulting from changes in deferred tax valuation allowances in Canada and the U.K.
[6] The adoption of ASU 2016-09 in the fourth quarter of 2016 did not impact the previously-reported quarterly results for 2016.
[7] Income from continuing operations includes purchase accounting expenses, acquisition and integration-related expenses and restructuring charges of $2.5 million, $0.3 million and $0.4 million, respectively.
[8] Income from continuing operations includes purchase accounting expenses and acquisition and integration-related expenses of $0.5 million and $0.4 million, respectively.
[9] Income from continuing operations includes acquisition and integration-related expenses, restructuring charges and debt settlement charges of $0.5 million, $1.2 million and $0.3 million, respectively.