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Calculation of Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Calculation of Basic and Diluted Earnings per Share [Abstract]        
Net Income from Continuing Operations $ 57.3 $ 43.5 $ 100.1 $ 82.6
Income from discontinued operations, net of income taxes 6.9 5.3 12.8 10.0
Net income 64.2 $ 48.8 112.9 $ 92.6
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent $ 64.2   $ 112.9  
Weighted-average number of common shares outstanding - basic 53.2 52.5 53.1 52.7
Dilutive effect of common share equivalents 0.7 0.5 0.7 0.4
Weighted-average number of common shares and share equivalents outstanding - diluted 53.9 53.0 53.8 53.1
Continuing operations $ 1.08 $ 0.83 $ 1.89 $ 1.57
Discontinued operations 0.13 0.10 0.24 0.19
Basic earnings per share: 1.21 0.93 2.13 1.76
Continuing operations 1.06 0.82 1.86 1.56
Discontinued operations 0.13 0.10 0.24 0.18
Diluted earnings per share: $ 1.19 $ 0.92 $ 2.10 $ 1.74