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Earnings Per Share - Computations of Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Numerator:    
Net income $ 28.4 $ 24.3
Denominator:    
Basic - weighted average shares outstanding (in shares) 18,665,570 18,449,430
Effect of dilutive securities 412,197 232,838
Diluted - weighted average shares outstanding (in shares) 19,077,767 18,682,268
Basic earnings per share (in dollars per share) $ 1.52 $ 1.32
Diluted earnings per share (in dollars per share) $ 1.49 $ 1.30