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Net Income Per Share and Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 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):
| Quarter Ended
| March 31,
| 2019 |  | 2018
Numerator: |  |  |
Net income | $ | 28.0 |  |  | $ | 25.7 |
Denominator – Weighted-average common shares outstanding (in thousands): |  |  |
Basic | 16,108 |  |  | 16,707 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares 1 | 264 |  |  | 324 |
Diluted | 16,372 |  |  | 17,031 |
Net income per common share, Basic: | $ | 1.74 |  |  | $ | 1.54 |
Net income per common share, Diluted: | $ | 1.71 |  |  | $ | 1.51 |
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1 | During the quarter ended March 31, 2019 a total of four 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 the quarter ended March 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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