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Preferred and Common Stockholders' Equity
 6 Months Ended
Jun. 30, 2022
Equity [Abstract]  
Preferred and Common Stockholders' Equity PREFERRED AND COMMON STOCKHOLDERS' EQUITY
The Company is authorized to issue up to 5.0 million shares of preferred stock, par value $0.01 per share. There were no preferred shares outstanding at June 30, 2022.
The Company is authorized to issue up to 150.0 million shares of common stock, par value $0.01 per share. There were 80.6 million shares issued and outstanding at June 30, 2022.
Common shares issued and outstanding
Six months ended
June 30,
(in millions)20222021
Beginning common stock issued and outstanding80.0 75.4 
Common stock issued upon exercise of options, vesting of restricted stock units, and purchases under employee stock purchase plan0.6 2.3 
Common stock issued and outstanding at end of period80.6 77.7 
Basic earnings per share is computed based on the weighted-average number of shares of common stock outstanding. Diluted earnings per share is computed based on the weighted-average number of shares of common stock, including the dilutive effect of common stock equivalents, outstanding. In periods when the Company has a net loss, stock awards are excluded from the calculation of diluted net loss per share as their inclusion would have an antidilutive effect.
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)2022202120222021
Denominator:
Weighted-average shares outstanding used to compute basic EPS80.4 77.2 80.3 76.6 
Effect of dilutive shares— — — — 
Weighted-average shares outstanding and dilutive securities used to compute diluted EPS80.4 77.2 80.3 76.6 
Certain outstanding options and restricted stock units (“RSUs”) were excluded from the computation of diluted earnings per share because the effect would have been anti-dilutive. These potential dilutive common shares, which may be dilutive to future diluted earnings per share, are as follows:
Three months ended
June 30,		Six months ended
June 30,
(in millions)2022202120222021
Anti-dilutive options and RSUs excluded from EPS computation5.4 7.0 5.4 7.0 
Stock Repurchase Program
In June 2016, the Company’s Board of Directors authorized a share repurchase program of $200.0 million of the Company’s outstanding common stock. The Company may repurchase its common stock from time to time or on an accelerated basis through open market transactions or privately negotiated transactions as determined by the Company's management. The amount and timing of stock repurchases under the program will depend on business and market conditions, stock price, trading restrictions, acquisition activity and other factors.  As of June 30, 2022, the Company has $110.7 million remaining under its current share repurchase authorization. No shares were repurchased during the six months ended June 30, 2022 or 2021.