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Preferred and Common Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2021
Equity [Abstract] |
Summary of Common Shares Issued and Outstanding | Common shares issued and outstanding
| Nine months ended September 30,
(in millions) | 2021 |  |  | 2020
Beginning common stock issued and outstanding | 75.4 |  |  |  | 74.5 |
Common stock issued upon exercise of options, vesting of restricted stock units, and purchases under employee stock purchase plan | 4.3 |  |  |  | 0.7 |
Common stock issued and outstanding at end of period | 79.7 |  |  |  | 75.2 |
Reconciliation of Denominators of Basic and Diluted Earnings Per Share Computations | The following is a reconciliation of the denominators of the basic and diluted earnings per share (“EPS”) computations:
| Three months ended September 30, |  | Nine months ended September 30,
(in millions) | 2021 |  |  | 2020 |  | 2021 |  |  | 2020
Denominator: |  |  |  |  |  |  |  |  |
Weighted-average shares outstanding used to compute basic EPS | 78.8 |  |  |  | 74.7 |  |  | 77.3 |  |  |  | 74.6 |
Effect of dilutive shares | 2.7 |  |  |  | — |  |  | — |  |  |  | — |
Weighted-average shares outstanding and dilutive securities used to compute diluted EPS | 81.5 |  |  |  | 74.7 |  |  | 77.3 |  |  |  | 74.6 |
Schedule of Potential Dilutive Common Shares | These potential dilutive common shares, which may be dilutive to future diluted earnings per share, are as follows:
| Three months ended September 30, |  | Nine months ended September 30,
(in millions) | 2021 |  |  | 2020 |  | 2021 |  |  | 2020
Anti-dilutive options and RSUs excluded from EPS computation | 0.1 |  |  |  | 7.3 |  |  | 4.9 |  |  |  | 7.3 |

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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=124432515&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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- Definition Tabular disclosure of the weighted average number of shares used in calculating basic net earnings per share (or unit) and diluted earnings per share (or unit). + 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 -URI http://asc.fasb.org/extlink&oid=124432515&loc=d3e3550-109257 + Details
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