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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, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator (in millions):
Net income available to common stockholders	$ 11.4	$ 35.6	$ 59.2	$ 88.0
Denominator (in thousands):
Weighted average common shares outstanding	23,977	24,121	23,989	24,162
Dilutive effect of stock options and awards	499	490	473	498
Denominator for diluted earnings per share	24,476	24,611	24,462	24,660
Net income per share, basic:	$ 0.48	$ 1.48	$ 2.47	$ 3.64
Net income per share, diluted:	$ 0.47	$ 1.45	$ 2.42	$ 3.57

X

- 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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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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