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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Calculation of Basic and Diluted Earnings per Share [Abstract]        
Net income $ 29.3 $ 47.2 $ 50.2 $ 85.3
Weighted-average number of common shares outstanding - basic (in shares) 43.8 45.7 43.8 46.1
Dilutive effect of common share equivalents (in shares) 0.2 0.4 0.2 0.4
Weighted-average number of common shares and share equivalents outstanding - diluted (in shares) 44.0 46.1 44.0 46.5
Basic earnings per share (in dollars per share) $ 0.67 $ 1.03 $ 1.15 $ 1.85
Diluted earnings per share (in dollars per share) $ 0.67 $ 1.02 $ 1.14 $ 1.83