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Earnings Per Share (Tables) | 3 Months Ended
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Mar. 31, 2015
Earnings Per Share [Abstract] |
Calculation of basic and diluted earnings per share | Basic and diluted net (loss) income per share were calculated as follows, for each period presented (in millions of dollars, except share and per share amounts):
| Quarter Ended
| March 31,
| 2015 |  | 2014
Numerator: |  |  |
Net (loss) income | $ | (292.2 | ) |  | $ | 15.8 |
Denominator - Weighted-average common shares outstanding (in thousands): |  |  |
Basic 1 | 17,344 |  |  | 17,921 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares | — |  |  | 122 |
Add: dilutive effect of warrants | — |  |  | 471 |
Diluted 2 | 17,344 |  |  | 18,514 |
Net (loss) income per common share, Basic: | $ | (16.85 | ) |  | $ | 0.88 |
Net (loss) income per common share, Diluted: | $ | (16.85 | ) |  | $ | 0.85 |
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1 | The basic weighted-average number of common shares outstanding during the periods excludes non-vested common shares, restricted stock units and performance shares.
2 | The diluted weighted-average number of common shares outstanding during the period was calculated using the treasury method.

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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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