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Net Income Per Share (Tables) | 9 Months Ended
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Sep. 30, 2020
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 for the periods presented (in millions of dollars, except share and per share amounts):
|  | Quarter Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  | $ | 0.4 |  |  | $ | 25.4 |  |  | $ | 22.9 |  |  | $ | 72.6 |
Denominator – Weighted-average common shares outstanding (in thousands): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 15,794 |  |  |  | 15,956 |  |  |  | 15,804 |  |  |  | 16,042 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares1 |  |  | 71 |  |  |  | 169 |  |  |  | 100 |  |  |  | 193 |
Diluted |  |  | 15,865 |  |  |  | 16,125 |  |  |  | 15,904 |  |  |  | 16,235 |
Net income per common share, Basic: |  | $ | 0.02 |  |  | $ | 1.59 |  |  | $ | 1.45 |  |  | $ | 4.52 |
Net income per common share, Diluted: |  | $ | 0.02 |  |  | $ | 1.57 |  |  | $ | 1.44 |  |  | $ | 4.47 |
1 | Quantities in the following discussion are denoted in whole shares. During the quarter and nine months ended September 30, 2020, approximately 69,000 shares and 41,000 shares, respectively, were excluded from the weighted-average diluted shares computation as their inclusion would have been anti-dilutive. During both the quarter and nine months ended September 30, 2019, approximately 7,000 shares 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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