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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2020
Equity [Abstract]  
Approved Share Repurchase Programs and Open Market Repurchases of Common Stock
As of December 31, 2020, we had the following approved share repurchase programs:
Board Approval Date
Total Authorized Amount(1) ($)
Authorized Amount Remaining ($)
May 2020500.0 500.0 
October 2019500.0 — 
November 2018500.0 — 
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(1) The authorized amounts exclude commissions applicable to any repurchases.
Pursuant to these programs, we made the following open market repurchases of our Class A common stock:
Year Ended December 31,Number of Shares Repurchased (#)
Aggregate Purchase Price(1) ($)
20209,986 541.7 
20197,125 458.6 
2018— — 
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(1) The aggregate purchase price includes commissions paid in connection with the repurchases.