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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, 2022	Dec. 31, 2021	Dec. 31, 2020
Numerator (in millions):
Net income available to common stockholders	$ 133.0	$ 93.1	$ 28.7
Denominator (in thousands):
Weighted average common shares outstanding	24,787	24,647	24,563
Dilutive effect of stock options and awards	195	207	216
Denominator for diluted earnings per share	24,982	24,854	24,779
Net income per share, basic:	$ 5.37	$ 3.78	$ 1.17
Net income per share, diluted:	$ 5.32	$ 3.75	$ 1.16

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- 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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