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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Calculation of Basic and Diluted Earnings per Share [Abstract]        
Net Income from Continuing Operations $ 66.3 $ 46.7 $ 166.4 $ 129.3
Income from discontinued operations, net of income taxes 145.7 5.6 158.5 15.6
Net income 212.0 $ 52.3 324.9 $ 144.9
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent $ 212.0   $ 324.9  
Weighted-average number of common shares outstanding - basic 52.7 52.5 53.0 52.6
Dilutive effect of common share equivalents 0.7 0.5 0.7 0.5
Weighted-average number of common shares and share equivalents outstanding - diluted 53.4 53.0 53.7 53.1
Continuing operations $ 1.26 $ 0.89 $ 3.14 $ 2.46
Discontinued operations 2.76 0.11 2.99 0.29
Basic earnings per share: 4.02 1.00 6.13 2.75
Continuing operations 1.24 0.88 3.10 2.44
Discontinued operations 2.73 0.11 2.95 0.29
Diluted earnings per share: $ 3.97 $ 0.99 $ 6.05 $ 2.73