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Net Income Per Share | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Net Income Per Share | 13. 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 quarter ended March 31, 2021 and March 31, 2020, 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 (in millions of dollars, except share and per share amounts):
|  | Quarter Ended March 31, |
|  | 2021 |  |  | 2020 |
Numerator: |  |  |  |  |  |  |  |
Net income |  | $ | 4.5 |  |  | $ | 29.1 |
Denominator – Weighted-average common shares outstanding (in thousands): |  |  |  |  |  |  |  |
Basic |  |  | 15,805 |  |  |  | 15,838 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares1 |  |  | 182 |  |  |  | 170 |
Diluted |  |  | 15,987 |  |  |  | 16,008 |
Net income per common share, Basic: |  | $ | 0.28 |  |  | $ | 1.83 |
Net income per common share, Diluted: |  | $ | 0.28 |  |  | $ | 1.81 |
1 |
| Quantities in the following discussion are denoted i n whole shares. During the quarter s ended March 31, 2021 and March 31, 2020, approximately 22,000 shares and 2,000 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109243012&loc=SL65017193-207537 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3630-109257 + Details
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