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Preferred and Common Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2021
Equity [Abstract]  
Summary of Common Shares Issued and Outstanding
Common shares issued and outstanding
Six months ended
June 30,
(in millions)20212020
Beginning common stock issued and outstanding75.4 74.5 
Common stock issued upon exercise of options, vesting of restricted stock units and purchases under employee stock purchase plan2.3 0.2 
Common stock issued and outstanding at end of period77.7 74.7 
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
June 30,
Six months ended
June 30,
(in millions)2021202020212020
Denominator:
Weighted-average shares outstanding used to compute basic EPS77.2 74.6 76.6 74.6 
Effect of dilutive shares— — — — 
Weighted-average shares outstanding and dilutive securities used to compute diluted EPS77.2 74.6 76.6 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:
June 30,
(in millions)20212020
Anti-dilutive options and RSUs excluded from EPS computation7.0 7.1