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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
Mar. 31, 2025
Mar. 31, 2024
Calculation of Basic and Diluted Earnings per Share [Abstract]    
Net income $ 20.9 $ 38.1
Weighted-average number of common shares outstanding - basic (in shares) 43.7 46.5
Dilutive effect of common share equivalents (in shares) 0.3 0.4
Weighted-average number of common shares and share equivalents outstanding - diluted (in shares) 44.0 46.9
Basic earnings per share (in dollars per share) $ 0.48 $ 0.82
Diluted earnings per share (in dollars per share) $ 0.48 $ 0.81