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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, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Numerator (in millions):
Net income available to common stockholders	$ 12.7	$ 30.1	$ 6.1	$ 81.1
Denominator (in thousands):
Weighted average common shares outstanding	24,570	24,491	24,555	24,476
Dilutive effect of stock options and awards	150	224	203	224
Denominator for diluted earnings per share	24,720	24,715	24,758	24,700
Net income per share, basic:	$ 0.52	$ 1.23	$ 0.25	$ 3.31
Net income per share, diluted:	$ 0.51	$ 1.22	$ 0.25	$ 3.28

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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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