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Net Income Per Share | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Net Income Per Share | 15. Net Income Per Share Basic net income per share is computed by dividing distributed and undistributed net income allocable to common shares by the weighted-average number of common shares outstanding during the applicable period. The basic weighted-average number of common shares outstanding during the period excludes non-vested share-based payment awards. Diluted net income per share was calculated under the treasury stock method for 2020, 2019 and 2018, which in all years was more dilutive than the two-class method. The following table sets forth the computation of basic and diluted net income per share (in millions of dollars, except share and per share amounts):
|  | Year Ended December 31, |
|  | 2020 |  |  | 2019 |  |  | 2018 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 28.8 |  |  | $ | 62.0 |  |  | $ | 91.7 |
Denominator – Weighted-average common shares outstanding (in thousands): |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 15,802 |  |  |  | 15,997 |  |  |  | 16,585 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares1 |  |  | 111 |  |  |  | 206 |  |  |  | 289 |
Diluted |  |  | 15,913 |  |  |  | 16,203 |  |  |  | 16,874 |
Net income per common share, Basic: |  | $ | 1.82 |  |  | $ | 3.88 |  |  | $ | 5.53 |
Net income per common share, Diluted: |  | $ | 1.81 |  |  | $ | 3.83 |  |  | $ | 5.43 |
1. | A total of 44,000 non-vested RSAs, RSUs and performance shares for the year ended December 31, 2020 were excluded from the weighted-average diluted shares computation as their inclusion would have been anti-dilutive. None were excluded for the years ended December 31, 2019 and December 31, 2018.

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