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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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator (in millions):
Net income available to common stockholders	$ 22.3	$ 21.8	$ 51.0	$ 44.0
Denominator (in thousands):
Weighted average common shares outstanding	24,483	24,409	24,468	24,389
Dilutive effect of stock options and awards	195	182	203	195
Denominator for diluted earnings per share	24,678	24,591	24,671	24,584
Net income per share, basic:	$ 0.91	$ 0.89	$ 2.08	$ 1.80
Net income per share, diluted:	$ 0.90	$ 0.89	$ 2.07	$ 1.79

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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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