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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Calculation of Basic and Diluted Earnings per Share [Abstract]        
Net Income from Continuing Operations $ 71.1 $ 66.3 $ 211.3 $ 166.4
Income from discontinued operations, net of income taxes 2.1 145.7 1.2 158.5
Net income $ 73.2 $ 212.0 $ 212.5 $ 324.9
Weighted-average number of common shares outstanding — basic 50.1 52.7 50.9 53.0
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 50.7 53.4 51.6 53.7
Continuing operations $ 1.42 $ 1.26 $ 4.15 $ 3.14
Basic earnings per share: 1.46 4.02 4.17 6.13
Continuing operations 1.40 1.24 4.09 3.10
Discontinued operations 0.04 2.73 0.02 2.95
Diluted earnings per share: $ 1.44 $ 3.97 $ 4.11 $ 6.05