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Earnings Per Share (Reconciliation of Basic and Diluted Earnings Per Share Computations) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings per common share:      
Net income $ 386.1 $ 154.8 $ 213.6
Weighted average common shares outstanding (in thousands) (in shares) 29,132 31,594 32,674
Earnings per common share (in dollars per share) $ 13.25 $ 4.90 $ 6.54
Earnings per common share - assuming dilution:      
Net income $ 386.1 $ 154.8 $ 213.6
Weighted average common shares outstanding (in thousands) (in shares) 29,132 31,594 32,674
Common equivalent shares:      
Share-based awards (in shares) 394 264 309
Weighted average common shares outstanding - assuming dilution (in thousands) (in shares) 29,526 31,858 32,983
Earnings per common share assuming dilution (in dollars per share) $ 13.08 $ 4.86 $ 6.48