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Net Loss Per Share (Tables) | 12 Months Ended
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Dec. 31, 2022
Earnings Per Share [Abstract] |
Basic and diluted loss per common share | Basic and diluted loss per common share was calculated as follows:
| Year ended December 31,
(dollars and shares in millions, except per common share amounts) | 2022 |  | 2021 |  | 2020
Net loss | $ | (282.5) |  |  | $ | (191.0) |  |  | $ | (119.3) |
Weighted average common shares outstanding - basic and diluted | 53.2 |  |  | 50.0 |  |  | 39.5 |
Net loss per common share - basic and diluted | $ | (5.31) |  |  | $ | (3.82) |  |  | $ | (3.02) |
Securities excluded from the computation of diluted net loss per share | The Company reported net losses for each of the years ended December 31 2022, 2021 and 2020, and therefore excluded all stock options, restricted stock awards and restricted stock units from the computation of diluted net loss per common share as their inclusion would have had an anti-dilutive effect, as summarized below:
| Year ended December 31,
(shares in millions) | 2022 |  | 2021 |  | 2020
Stock options | 6.8 |  |  | 5.3 |  |  | 4.3 |
Restricted stock awards | — |  |  | — |  |  | 0.2 |
Restricted stock units | 0.5 |  |  | 0.1 |  |  | 0.1 |
| 7.3 |  |  | 5.4 |  |  | 4.6 |

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