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Net Income (Loss) per Share (Tables) | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
Schedule of Computations of Basic and Diluted Net Income (Loss) per Share | The basic and diluted net income (loss) per share computations were calculated as follows:
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
|  | (Dollars in millions, except share and per share data) |
Numerator: |  |  |  |  |  |  |  |
Net (loss) income |  | $ | (19.2 | ) |  | $ | 8.6 |
Denominator: |  |  |  |  |  |  |  |
Weighted-average shares outstanding - basic |  |  | 148,716,050 |  |  |  | 144,645,325 |
Effect of dilutive equity instruments |  |  | — |  |  |  | 6,533,173 |
Weighted-average shares outstanding - diluted |  |  | 148,716,050 |  |  |  | 151,178,498 |
Net (loss) income per share - basic |  | $ | (0.13 | ) |  | $ | 0.06 |
Net (loss) income per share - diluted |  | $ | (0.13 | ) |  | $ | 0.06 |
Schedule of Potentially Dilutive Weighted Average Shares Excluded from Calculation of Diluted Net Income (Loss) per Share | The following potentially dilutive weighted-average shares were excluded from the calculation of diluted net income (loss) per share because their effect would have been anti-dilutive:
|  | Three Months Ended March 31, |
|  | 2021 |  |  | 2020 |
Stock options |  |  | 5,448,133 |  |  |  | 121,381 |
Restricted stock units |  |  | 518,939 |  |  |  | 21,869 |
Performance stock units |  |  | 604,193 |  |  |  | — |

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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 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/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=6371337&loc=d3e3550-109257 + Details
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