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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator (in millions):        
Net income available to common stockholders $ 28.9 $ 32.3 $ 62.1 $ 68.8
Denominator (in thousands):        
Weighted average common shares outstanding 24,868 24,805 24,835 24,798
Dilutive effect of stock options and awards 112 166 175 169
Denominator for diluted earnings per share 24,980 24,971 25,010 24,967
Net income per share, basic: $ 1.16 $ 1.3 $ 2.5 $ 2.77
Net income per share, diluted: $ 1.16 $ 1.29 $ 2.48 $ 2.76