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Net Income Per Share (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Numerator (basic and diluted): |  |  |  |
Net income | $ 41.0 | $ 25.8 | $ 87.3 | $ 61.8
Less: Dividends paid to participating securities | (0.1) | (0.1) | (0.2) | (0.3)
Less: Undistributed earnings available to participating securities | (0.2) | (0.1) | (0.4) | (0.2)
Undistributed and distributed earnings available to common stockholders | $ 40.7 | $ 25.6 | $ 86.7 | $ 61.3
Denominator: |  |  |  |
Average number of common shares outstanding (in shares) | 30,569,600 | 30,422,800 | 30,541,600 | 30,400,400
Effect of dilutive stock-based compensation (in shares) | 153,200 | 146,700 | 141,500 | 134,300
Average number of common and potential common shares outstanding (in shares) | 30,722,800 | 30,569,500 | 30,683,100 | 30,534,700

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