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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, 2020	Mar. 31, 2019
Numerator (in millions):
Net income available to common stockholders	$ 33.1	$ 28.7
Denominator (in thousands):
Weighted average common shares outstanding	24,529	24,437
Dilutive effect of stock options and awards	213	157
Denominator for diluted earnings per share	24,742	24,594
Net income per share, basic:	$ 1.35	$ 1.17
Net income per share, diluted:	$ 1.34	$ 1.17

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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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