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Earnings Per Share - Computation of Earnings (Loss) Per Common Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]      
Net income $ 216.3 $ 157.4 $ 120.4
Weighted average shares outstanding - basic (shares) 60.9 60.7 60.5
Dilutive effect of common stock equivalents (shares) 0.8 0.8 0.7
Weighted average shares outstanding - Diluted (shares) 61.7 61.5 61.2
Basic earnings per share:      
Net earnings per share (usd per share) $ 3.55 $ 2.59 $ 1.99
Diluted earnings per share:      
Net earnings per share (usd per share) $ 3.50 $ 2.56 $ 1.97