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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, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator (in millions):
Net income available to common stockholders	$ 28.7	$ 112.2	$ 85.0
Denominator (in thousands):
Weighted average common shares outstanding	24,563	24,482	24,401
Dilutive effect of stock options and awards	216	246	202
Denominator for diluted earnings per share	24,779	24,728	24,603
Net income per share, basic:	$ 1.17	$ 4.58	$ 3.48
Net income per share, diluted:	$ 1.16	$ 4.54	$ 3.45

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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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