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Earnings Per Share - Schedule of Computations of Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator:        
Net income $ 22.9 $ 15.6 $ 78.5 $ 42.5
Denominator:        
Basic - weighted average shares outstanding (in shares) 18,570,293 18,515,851 18,485,806 18,495,640
Effect of dilutive securities 308,018 176,065 261,322 217,697
Diluted - weighted average shares outstanding (in shares) 18,878,311 18,691,916 18,747,128 18,713,337
Basic earnings per share (in dollars per share) $ 1.23 $ 0.84 $ 4.25 $ 2.30
Diluted earnings per share (in dollars per share) $ 1.21 $ 0.83 $ 4.19 $ 2.27