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Stockholders' Equity - Basic and Diluted Shares Reconciliation (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Numerator (basic and diluted): |  |  |  |  |  |  |  |  |  |  |
Net income | $ (27.3) | $ 25.8 | $ 22.3 | $ 13.7 | $ 17.0 | $ 18.7 | $ 26.0 | $ 21.1 | $ 34.5 | $ 82.8 | $ 89.7
Less: Dividends paid to participating securities |  |  |  |  |  |  |  |  | (0.4) | (0.3) | (0.2)
Less: Undistributed earnings available to participating securities |  |  |  |  |  |  |  |  | 0.0 | (0.2) | (0.3)
Undistributed and distributed earnings available to common stockholders |  |  |  |  |  |  |  |  | $ 34.1 | $ 82.3 | $ 89.2
Denominator: |  |  |  |  |  |  |  |  |  |  |
Average number of common shares outstanding (shares) |  |  |  |  |  |  |  |  | 30,407,100 | 30,310,900 | 30,251,400
Effect of dilutive stock-based compensation (shares) |  |  |  |  |  |  |  |  | 142,200 | 152,500 | 122,900
Average number of common and potential common shares outstanding (shares) |  |  |  |  |  |  |  |  | 30,549,300 | 30,463,400 | 30,374,300

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