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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Calculation of Basic and Diluted Earnings per Share [Abstract]        
Net Income from Continuing Operations $ 60.1 $ 72.6 $ 109.6 $ 140.2
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax 0.0 (0.1) 0.0 (0.9)
Net income $ 60.1 $ 72.5 $ 109.6 $ 139.3
Weighted-average number of common shares outstanding — basic 49.0 51.0 49.1 51.3
Dilutive effect of common share equivalents 0.2 0.6 0.4 0.7
Weighted-average number of common shares and share equivalents outstanding — diluted 49.2 51.6 49.5 52.0
Continuing operations $ 1.23 $ 1.42 $ 2.23 $ 2.73
Basic earnings per share: 1.23 1.42 2.23 2.72
Continuing operations 1.22 1.41 2.21 2.70
Discontinued operations 0 0 0 (0.01)
Diluted earnings per share: $ 1.22 $ 1.41 $ 2.21 $ 2.69