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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		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator (in millions):
Net income available to common stockholders	$ 30.1	$ 20.6	$ 81.1	$ 64.6
Denominator (in thousands):
Weighted average common shares outstanding	24,491	24,419	24,476	24,399
Dilutive effect of stock options and awards	224	178	224	181
Denominator for diluted earnings per share	24,715	24,597	24,700	24,580
Net income per share, basic:	$ 1.23	$ 0.84	$ 3.31	$ 2.65
Net income per share, diluted:	$ 1.22	$ 0.84	$ 3.28	$ 2.63

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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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