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Earnings Per Share (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator (in millions):
Net income available to common stockholders	$ 18.0	$ 24.6
Denominator (in thousands):
Weighted average common shares outstanding	23,404	23,055
Dilutive effect of stock options and awards	611	768
Denominator for diluted earnings per share	24,015	23,823
Net income per share, basic	$ 0.77	$ 1.07
Net income per share, diluted	$ 0.75	$ 1.03

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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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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