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Net Income Per Share (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Numerator (basic and diluted): |  |  |  |
Net income | $ 22.3 | $ 26.0 | $ 36.0 | $ 47.1
Less: Dividends paid to participating securities | (0.1) | 0.0 | (0.2) | (0.1)
Less: Undistributed earnings available to participating securities | (0.1) | (0.2) | (0.1) | (0.2)
Undistributed and distributed earnings available to common stockholders | $ 22.1 | $ 25.8 | $ 35.7 | $ 46.8
Denominator: |  |  |  |
Average number of common shares outstanding (in shares) | 30,412,900 | 30,313,200 | 30,389,000 | 30,304,100
Effect of dilutive stock-based compensation (in shares) | 133,800 | 134,500 | 128,100 | 131,100
Average number of common and potential common shares outstanding (in shares) | 30,546,700 | 30,447,700 | 30,517,100 | 30,435,200

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