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Earnings per Share - Summary of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Numerator (in millions):      
Net income available to common stockholders $ 35.6 $ 139.1 $ 133.0
Denominator (in thousands):      
Weighted average common shares outstanding 24,932 24,851 24,787
Dilutive effect of stock options and awards 187 171 195
Denominator for diluted earnings per share 25,119 25,022 24,982
Net income per share, basic: $ 1.43 $ 5.6 $ 5.37
Net income per share, diluted: $ 1.42 $ 5.56 $ 5.32