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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
Mar. 31, 2023
Mar. 31, 2022
Calculation of Basic and Diluted Earnings per Share [Abstract]    
Net Income from Continuing Operations $ 49.5 $ 67.6
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax 0.0 (0.8)
Net income $ 49.5 $ 66.8
Weighted-average number of common shares outstanding — basic 49.3 51.6
Dilutive effect of common share equivalents 0.5 0.7
Weighted-average number of common shares and share equivalents outstanding — diluted 49.8 52.3
Continuing operations $ 1.00 $ 1.31
Basic earnings per share: 1.00 1.30
Continuing operations 0.99 1.29
Discontinued operations 0 (0.01)
Diluted earnings per share: $ 0.99 $ 1.28