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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, 2021	Mar. 31, 2020
Numerator (in millions):
Net income available to common stockholders	$ 23.4	$ 33.1
Denominator (in thousands):
Weighted average common shares outstanding	24,601	24,529
Dilutive effect of stock options and awards	239	213
Denominator for diluted earnings per share	24,840	24,742
Net income per share, basic:	$ 0.95	$ 1.35
Net income per share, diluted:	$ 0.94	$ 1.34

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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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