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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2020
Earnings Per Share [Abstract] |
Reconciliation of the weighted-average number of common shares used to compute basic earnings per share ("EPS") to those used to compute diluted EPS | The following table sets forth the reconciliation of the weighted-average number of common shares used to compute basic earnings per share to those used to compute diluted EPS:
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
| (Shares in millions)
Weighted-average number of common shares outstanding-basic | 83.0 |  |  | 76.8 |  |  | 64.7 |
Add: effect of dilutive share-based compensation awards | 0.2 |  |  | — |  |  | 0.8 |
Weighted-average number of shares-diluted | 83.2 |  |  | 76.8 |  |  | 65.5 |
Schedule of antidilutive securities excluded from computation of earnings per share | The following table shows stock options, restricted stock units, and performance stock units that are excluded from the computation of diluted earnings per share as the shares would have been anti-dilutive:
| Years Ended December 31,
| 2020 |  | 2019 |  | 2018
| (Shares in millions)
Stock options | 3.2 |  |  | 3.0 |  |  | 2.7 |
Restricted stock units | 0.2 |  |  | 0.1 |  |  | — |
Performance stock units | 0.3 |  |  | 0.4 |  |  | 0.1 |
Total | 3.7 |  |  | 3.5 |  |  | 2.8 |

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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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