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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Calculation of Basic and Diluted Earnings per Share [Abstract]        
Net Income from Continuing Operations $ 72.6 $ 57.3 $ 140.2 $ 100.1
Income from discontinued operations, net of income taxes (0.1) 6.9 (0.9) 12.8
Net income 72.5 64.2 139.3 $ 112.9
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent $ 72.5 $ 64.2 $ 139.3  
Weighted-average number of common shares outstanding — basic 51.0 53.2 51.3 53.1
Dilutive effect of common share equivalents 0.6 0.7 0.7 0.7
Weighted-average number of common shares and share equivalents outstanding — diluted 51.6 53.9 52.0 53.8
Continuing operations $ 1.42 $ 1.08 $ 2.73 $ 1.89
Basic earnings per share: 1.42 1.21 2.72 2.13
Continuing operations 1.41 1.06 2.70 1.86
Discontinued operations 0 0.13 (0.01) 0.24
Diluted earnings per share: $ 1.41 $ 1.19 $ 2.69 $ 2.10