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Stockholders' Equity
 9 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Stockholders' Equity
8. Stockholders’ Equity
Share-Based Compensation
Our share-based compensation expense is associated with RSUs, PSUs, and our Employee Stock Purchase Plan, or ESPP. The following table summarizes our share-based compensation expense included in our consolidated statements of operations for the periods shown:

Three Months Ended
September 30,		Nine Months Ended
September 30,
(In millions)2023202220232022
Cost of sales$3.9 $3.0 $11.1 $8.1 
Research and development11.4 10.8 34.3 32.0 
Selling, general and administrative23.7 17.0 68.5 52.4 
Total share-based compensation expense$39.0 $30.8 $113.9 $92.5 
At September 30, 2023, unrecognized estimated compensation costs related to RSUs, PSUs and ESPP totaled $238.4 million and are expected to be recognized through 2027.
Equity Award Activity
The total vest date fair value of RSUs and PSUs that vested during the nine months ended September 30, 2023 was $138.5 million and $9.9 million, respectively.
Share Repurchase Program and Treasury Shares
On July 26, 2022, a duly authorized committee of our Board of Directors authorized and approved a share repurchase program of up to $700.0 million of our outstanding common stock, with a repurchase period that ended on June 30, 2023 (the “2022 Share Repurchase Program”). Shares of common stock repurchased under the 2022 Share Repurchase Program became treasury shares.
We repurchased approximately $557.7 million of our outstanding common stock throughout the duration of the 2022 Share Repurchase Program. The 2022 Share Repurchase Program and the remaining authorization of approximately $142.3 million expired on June 30, 2023. There were no share repurchases under the 2022 Share Repurchase Program in 2023.
In May 2023, we used a portion of the proceeds of the 2028 Notes to repurchase 1.6 million shares of our common stock for $188.7 million, excluding excise tax due under the Inflation Reduction Act of 2022, for an average per share price of $118.12, via privately negotiated transactions, independent of the 2022 Share Repurchase Program.
Repurchased shares of our common stock are held as treasury shares until they are reissued or retired. We have not yet determined the ultimate disposition of repurchased shares and consequently we continue to hold them as treasury shares rather than retiring them. Authorization of future stock repurchase programs is subject to the final determination of our Board of Directors.