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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, 2024	Mar. 31, 2023
Numerator (in millions):
Net income available to common stockholders	$ 41.4	$ 33.2
Denominator (in thousands):
Weighted average common shares outstanding	24,893	24,801
Dilutive effect of stock options and awards	173	161
Denominator for diluted earnings per share	25,066	24,962
Net income per share, basic:	$ 1.66	$ 1.34
Net income per share, diluted:	$ 1.65	$ 1.33

X

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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