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Net Income Per Share and Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 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 |  | Six Months Ended
| June 30, |  | June 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Numerator: |  |  |  |  |  |  |
Net income | $ | 19.2 |  |  | $ | 20.7 |  |  | $ | 47.2 |  |  | $ | 46.4 |
Denominator – Weighted-average common shares outstanding (in thousands): |  |  |  |  |  |  |
Basic | 16,063 |  |  | 16,685 |  |  | 16,085 |  |  | 16,696 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares 1 | 177 |  |  | 220 |  |  | 213 |  |  | 266 |
Diluted | 16,240 |  |  | 16,905 |  |  | 16,298 |  |  | 16,962 |
Net income per common share, Basic: | $ | 1.19 |  |  | $ | 1.24 |  |  | $ | 2.93 |  |  | $ | 2.78 |
Net income per common share, Diluted: | $ | 1.18 |  |  | $ | 1.22 |  |  | $ | 2.89 |  |  | $ | 2.74 |
____________________ 1 During the quarter and six months ended June 30, 2019, a total of nine thousand and five thousand securities were excluded, respectfully, from the weighted-average diluted shares computation as their inclusion would have been anti-dilutive. During the quarter and six months ended June 30, 2018, a total of two thousand and one thousand securities were excluded, respectfully, 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://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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