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Net Income Per Share | 3 Months Ended
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Mar. 31, 2020
Earnings Per Share [Abstract] |
Net Income per Share | 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 the quarters ended March 31, 2020 and March 31, 2019, which in both periods was more dilutive than the two-class method. The following table sets forth the computation of basic and diluted net income per share for the periods presented (in millions of dollars, except share and per share amounts):
| Quarter Ended
| March 31,
| 2020 |  | 2019
Numerator: |  |  |
Net income | $ | 29.1 |  |  | $ | 28.0 |
Denominator – Weighted-average common shares outstanding (in thousands): |  |  |
Basic | 15,838 |  |  | 16,108 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares 1 | 170 |  |  | 264 |
Diluted | 16,008 |  |  | 16,372 |
Net income per common share, Basic: | $ | 1.83 |  |  | $ | 1.74 |
Net income per common share, Diluted: | $ | 1.81 |  |  | $ | 1.71 |
____________________ 1 During the quarters ended March 31, 2020 and March 31, 2019, a total of two thousand and four thousand shares, respectively, were excluded from the weighted-average diluted shares computation as their inclusion would have been anti-dilutive.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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