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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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Earnings Per Share [Abstract]                      
Income from continuing operations $ 29.7 [1] $ 28.4 [2] $ 32.8 [3] $ 17.5 [4] $ 32.2 [5] $ 21.7 [6] $ 26.9 [7] $ 12.9 [8] $ 108.4 $ 93.7 $ 60.5
Gain from discontinued operations and disposal, net of tax 0.1 0.0 0.0 0.0 0.3 0.0 0.0 0.0 0.1 0.3 1.1
Net income $ 29.8 $ 28.4 $ 32.8 $ 17.5 $ 32.5 $ 21.7 $ 26.9 $ 12.9 $ 108.5 $ 94.0 $ 61.6
Weighted average shares outstanding - basic (shares)                 60.2 59.9 59.7
Dilutive effect of common stock equivalents (shares)                 1.4 1.3 0.7
Weighted average shares outstanding - Diluted (shares)                 61.6 61.2 60.4
Basic earnings per share:                      
Earnings from continuing operations (usd per share)                 $ 1.80 $ 1.56 $ 1.01
Earnings from discontinued operations and disposal, net of tax (usd per share)                 0.00 0.01 0.02
Net earnings per share (usd per share)                 1.80 1.57 1.03
Diluted earnings per share:                      
Earnings from continuing operations (usd per share) $ 0.48 $ 0.46 $ 0.54 $ 0.29 $ 0.53 $ 0.36 $ 0.44 $ 0.21 1.76 1.53 1.00
Earnings from discontinued operations and disposal, net of tax (usd per share) 0.00 0 0 0 0.00 0 0 0 0.00 0.01 0.02
Net earnings per share (usd per share) $ 0.48 $ 0.46 $ 0.54 $ 0.29 $ 0.53 $ 0.36 $ 0.44 $ 0.21 $ 1.76 $ 1.54 $ 1.02
[1]
Income from continuing operations includes pre-tax purchase accounting expenses and acquisition and integration-related expenses of $0.3 million and $0.6 million, respectively, as well as a $0.8 million benefit from changes in state deferred tax valuation allowances.
[2]
Income from continuing operations includes pre-tax purchase accounting expenses and acquisition and integration-related expenses of $0.2 million and $0.4 million, respectively.
[3]
Income from continuing operations includes pre-tax purchase accounting expenses and acquisition and integration-related expenses of $0.2 million and $0.9 million, respectively.
[4]
Income from continuing operations includes pre-tax purchase accounting expenses and acquisition and integration-related expenses of $0.1 million and $0.6 million, respectively.
[5]
Income from continuing operations includes pre-tax purchase accounting expenses and acquisition and integration-related expenses of $0.1 million and $0.2 million, respectively, as well as an $8.6 million net benefit from tax planning strategies.
[6]
Income from continuing operations includes pre-tax purchase accounting expenses and acquisition and integration-related expenses of $0.1 million and $0.4 million, respectively.
[7]
Income from continuing operations includes pre-tax purchase accounting expenses and acquisition and integration-related expenses of $0.4 million and $0.4 million, respectively.
[8]
Income from continuing operations includes pre-tax purchase accounting expenses, acquisition and integration-related expenses and hearing loss settlement charges of $0.6 million, $0.5 million and $0.4 million, respectively.