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Earnings Per Share (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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Calculation of Basic and Diluted Earnings per Share [Abstract]        
Net income $ 38.1 $ 47.5 $ 88.3 $ 132.8
Weighted-average number of common shares outstanding - basic (in shares) 43.5 44.5 43.7 45.4
Dilutive effect of common share equivalents (in shares) 0.2 0.5 0.2 0.5
Weighted-average number of common shares and share equivalents outstanding - diluted (in shares) 43.7 45.0 43.9 45.9
Basic earnings per share (in dollars per share) $ 0.88 $ 1.07 $ 2.02 $ 2.93
Diluted earnings per share (in dollars per share) $ 0.87 $ 1.06 $ 2.01 $ 2.89