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Preferred and Common Stockholders' Equity (Tables)

9 Months Ended

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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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.

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-Name Accounting Standards Codification
-Topic 260
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-Section 50
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Tabular disclosure of the change in common stock outstanding.

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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).

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