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Net Income Per Share and Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2018
Earnings Per Share [Abstract] |
Calculation of basic and diluted earnings per share | basic and diluted net income per share for periods presented (in millions of dollars, except share and per share amounts):
| Quarter Ended
| March 31,
| 2018 |  | 2017
Numerator: |  |  |
Net income | $ | 25.7 |  |  | $ | 36.0 |
Denominator – Weighted-average common shares outstanding (in thousands): |  |  |
Basic | 16,707 |  |  | 17,385 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares | 324 |  |  | 218 |
Diluted | 17,031 |  |  | 17,603 |
Net income per common share, Basic: | $ | 1.54 |  |  | $ | 2.07 |
Net income per common share, Diluted: | $ | 1.51 |  |  | $ | 2.04 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share | The following securities were excluded from the weighted-average diluted shares computation for the periods presented as their inclusion would have been anti-dilutive (in thousands of shares):
| Quarter Ended
| March 31,
| 2018 |  | 2017
Options to purchase common shares 1 | — |  |  | 2 |
Non-vested common shares, restricted stock units and performance shares | — |  |  | 64 |
Total excluded | — |  |  | 64 |
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1 | Related to the 1,543 fully-vested stock options that were outstanding as of March 31, 2017 and subsequently expired on April 2, 2017.

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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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/2003/role/presentationRef -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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