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Net Income Per Share and Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 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):
| Quarter Ended |  | Nine Months Ended
| September 30, |  | September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Numerator: |  |  |  |  |  |  |
Net income | $ | 25.4 |  |  | $ | 21.7 |  |  | $ | 72.6 |  |  | $ | 68.1 |
Denominator – Weighted-average common shares outstanding (in thousands): |  |  |  |  |  |  |
Basic | 15,956 |  |  | 16,573 |  |  | 16,042 |  |  | 16,654 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares 1 | 169 |  |  | 210 |  |  | 193 |  |  | 228 |
Diluted | 16,125 |  |  | 16,783 |  |  | 16,235 |  |  | 16,882 |
Net income per common share, Basic: | $ | 1.59 |  |  | $ | 1.31 |  |  | $ | 4.52 |  |  | $ | 4.09 |
Net income per common share, Diluted: | $ | 1.57 |  |  | $ | 1.29 |  |  | $ | 4.47 |  |  | $ | 4.03 |
____________________ 1 During both the quarter and nine months ended September 30, 2019, a total of seven thousand securities were excluded from the weighted-average diluted shares computation as their inclusion would have been anti-dilutive. There were no anti-dilutive securities during both the quarter and nine months ended September 30, 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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