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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator (in millions):
Net income available to common stockholders	$ 20.6	$ 23.3	$ 64.6	$ 66.6
Denominator (in thousands):
Weighted average common shares outstanding	24,419	24,137	24,399	24,119
Dilutive effect of stock options and awards	178	428	181	450
Denominator for diluted earnings per share	24,597	24,565	24,580	24,569
Net income per share, basic:	$ 0.84	$ 0.97	$ 2.65	$ 2.76
Net income per share, diluted:	$ 0.84	$ 0.95	$ 2.63	$ 2.71

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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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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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