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Net Income Per Share and Stockholders' Equity, Calculation of EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Numerator: |  |
Net income | $ 28.0 | $ 25.7
Denominator — Weighted-average common shares outstanding (in thousands): |  |
Basic (shares) | 16,108 | 16,707
Add: dilutive effect of non-vested common shares, restricted stock units, performance shares and stock options (shares) | 264 | 324
Diluted (shares) | 16,372 | 17,031
Net income per common share: |  |
Basic (in dollars per share) | $ 1.74 | $ 1.54
Earnings per common share, Diluted: |  |
Diluted (in dollars per share) | $ 1.71 | $ 1.51

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