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Earnings Per Share - Summary of Earnings Per Share (Detail) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Numerator (in millions):
Net income available to common stockholders	$ 16.9	$ 18.0
Denominator (in thousands):
Weighted average common shares outstanding	24,362	23,404
Dilutive effect of stock options and awards	273	611
Denominator for diluted earnings per share	24,635	24,015
Net income per share, basic:	$ 0.69	$ 0.77
Net income per share, diluted:	$ 0.69	$ 0.75

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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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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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