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Net Income Per Share (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Schedule of Calculation of Basic and Diluted Net Income Per Share | 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 Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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