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Earnings Per Share - Summary of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Numerator (in millions):    
Net income available to common stockholders $ 32.8 $ 41.4
Denominator (in thousands):    
Weighted average common shares outstanding 24,970 24,893
Dilutive effect of stock options and awards 132 173
Denominator for diluted earnings per share 25,102 25,066
Net income per share, basic: $ 1.31 $ 1.66
Net income per share, diluted: $ 1.31 $ 1.65