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Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Earnings Per Share [Abstract]      
Income from continuing operations $ 266.9 $ 231.8 $ 177.6
Income from discontinued operations, net of income taxes 1.2 178.1 22.7
Net income $ 268.1 $ 409.9 $ 200.3
Weighted Average Number of Shares Outstanding Reconciliation      
Weighted-average number of common shares outstanding - basic 50.6 52.7 52.7
Dilutive effect of common share equivalents 0.7 0.8 0.6
Weighted Average Number of Shares Outstanding, Diluted, Total 51.3 53.5 53.3
Continuing operations (in dollars per share) $ 5.27 $ 4.40 $ 3.37
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share 0.03 3.38 0.43
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Basic Share 0.03    
Earnings per share (in dollars per share) 5.30 7.78 3.80
Continuing operations (in dollars per share) 5.21 4.33 3.33
Discontinued operations (in dollars per share) 0.02 3.33 0.43
Earnings per share (in dollars per share) $ 5.23 $ 7.66 $ 3.76