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Earnings Per Share - Summary of Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator (in millions):
Net income available to common stockholders	$ 23.4	$ 12.7	$ 69.2	$ 6.1
Denominator (in thousands):
Weighted average common shares outstanding	24,643,000	24,570,000	24,624,000	24,555,000
Dilutive effect of stock options and awards	221,000	150,000	248,000	203,000
Denominator for diluted earnings per share	24,864,000	24,720,000	24,872,000	24,758,000
Net income per share, basic:	$ 0.95	$ 0.52	$ 2.81	$ 0.25
Net income per share, diluted:	$ 0.94	$ 0.51	$ 2.78	$ 0.25

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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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