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Net Income Per Share and Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Earnings Per Share [Abstract] |
Calculation of basic and diluted earnings 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):
|  | Year Ended December 31,
|  | 2019 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |
Net income |  | $ | 62.0 |  |  | $ | 91.7 |  |  | $ | 45.4 |
Denominator – Weighted-average common shares outstanding (in thousands): |  |  |  |  |  |
Basic |  | 15,997 |  |  | 16,585 |  |  | 16,996 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares 1 |  | 206 |  |  | 289 |  |  | 263 |
Diluted |  | 16,203 |  |  | 16,874 |  |  | 17,259 |
Net income per common share, Basic: |  | $ | 3.88 |  |  | $ | 5.53 |  |  | $ | 2.67 |
Net income per common share, Diluted: |  | $ | 3.83 |  |  | $ | 5.43 |  |  | $ | 2.63 |
____________ 1. A total of 52,000 non-vested RSAs, RSUs and performance shares for the year ended December 31, 2017 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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- 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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