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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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Calculation of Basic and Diluted Earnings per Share [Abstract]        
Net Income from Continuing Operations $ 59.4 $ 71.1 $ 169.0 $ 211.3
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax 0.0 2.1 0.0 1.2
Net income $ 59.4 $ 73.2 $ 169.0 $ 212.5
Weighted-average number of common shares outstanding — basic 48.1 50.1 48.8 50.9
Dilutive effect of common share equivalents 0.3 0.6 0.4 0.7
Weighted-average number of common shares and share equivalents outstanding — diluted 48.4 50.7 49.2 51.6
Continuing operations $ 1.23 $ 1.42 $ 3.46 $ 4.15
Basic earnings per share: 1.23 1.46 3.46 4.17
Continuing operations 1.23 1.40 3.43 4.09
Discontinued operations 0 0.04 0 0.02
Diluted earnings per share: $ 1.23 $ 1.44 $ 3.43 $ 4.11