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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, 2016	Mar. 31, 2015
Numerator (in millions):
Net income available to common stockholders	$ 18.9	$ 17.9
Denominator (in thousands):
Weighted average common shares outstanding	24,019	24,301
Dilutive effect of stock options and awards	464	507
Denominator for diluted earnings per share	24,483	24,808
Net income per share, basic:	$ 0.79	$ 0.74
Net income per share, diluted:	$ 0.77	$ 0.72

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- Definition

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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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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