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Earnings Per Share (Tables) | 6 Months Ended
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Jun. 30, 2015
Earnings Per Share [Abstract] |
Calculation of basic and diluted earnings per share | Basic and diluted net income (loss) per share were calculated as follows, for each period presented (in millions of dollars, except share and per share amounts):
| Quarter Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Numerator: |  |  |  |  |  |  |
Net income (loss) | $ | 20.2 |  |  | $ | 24.5 |  |  | $ | (272.0 | ) |  | $ | 40.3 |
Denominator - Weighted-average common shares outstanding (in thousands): |  |  |  |  |  |  |
Basic 1 | 17,006 |  |  | 17,841 |  |  | 17,233 |  |  | 17,889 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares | 247 |  |  | 112 |  |  | — |  |  | 133 |
Add: dilutive effect of warrants | 939 |  |  | 505 |  |  | — |  |  | 490 |
Diluted 2 | 18,192 |  |  | 18,458 |  |  | 17,233 |  |  | 18,512 |
Net income (loss) per common share, Basic: | $ | 1.19 |  |  | $ | 1.38 |  |  | $ | (15.78 | ) |  | $ | 2.25 |
Net income (loss) per common share, Diluted: | $ | 1.11 |  |  | $ | 1.33 |  |  | $ | (15.78 | ) |  | $ | 2.18 |
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1 | The basic weighted-average number of common shares outstanding during the periods presented excludes non-vested common shares, restricted stock units and performance shares.
2 | The diluted weighted-average number of common shares outstanding during the periods presented was calculated using the treasury method.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] | The following securities were excluded from the weighted-average diluted shares computation for the quarters ended June 30, 2015 and June 30, 2014 as their inclusion would have been anti-dilutive (in thousands of shares):
| Quarter Ended |  | Six Months Ended
| June 30, |  | June 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Options to purchase common shares | — |  |  | 21 |  |  | 17 |  |  | 21 |
Non-vested common shares, restricted stock units and performance shares | — |  |  | 43 |  |  | 243 |  |  | 28 |
Warrants | — |  |  | — |  |  | 799 |  |  | — |
Total excluded | — |  |  | 64 |  |  | 1,059 |  |  | 49 |

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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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