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Net (Loss) Income Per Share (Tables) | 12 Months Ended
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Dec. 31, 2021
Earnings Per Share [Abstract] |
Schedule of Calculation of Basic and Diluted Net (Loss) Income Per Share | The following table sets forth the computation of basic and diluted net (loss) income per share (in millions of dollars, except share and per share amounts):
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |  |  | 2019 |
Numerator: |  |  |  |  |  |  |  |  |  |  |  |
Net (loss) income |  | $ | (18.5 | ) |  | $ | 28.8 |  |  | $ | 62.0 |
Denominator – Weighted-average common shares outstanding (in thousands): |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 15,836 |  |  |  | 15,802 |  |  |  | 15,997 |
Add: dilutive effect of non-vested common shares, restricted stock units and performance shares1 |  |  | — |  |  |  | 111 |  |  |  | 206 |
Diluted |  |  | 15,836 |  |  |  | 15,913 |  |  |  | 16,203 |
Net (loss) income per common share, Basic: |  | $ | (1.17 | ) |  | $ | 1.82 |  |  | $ | 3.88 |
Net (loss) income per common share, Diluted: |  | $ | (1.17 | ) |  | $ | 1.81 |  |  | $ | 3.83 |
1. | Quantities in the following discussion are denoted in whole shares. For the year ended December 31, 2021, approximately 213,000 potentially dilutive shares were excluded from the computation of net loss per share as their effect would have been anti‑dilutive. A total of 44,000 non-vested RSAs, RSUs and performance shares for the year ended December 31, 2020 were excluded from the weighted-average diluted shares computation as their inclusion would have been anti-dilutive. No shares were excluded for the year ended December 31, 2019.

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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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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