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Stockholders' Equity
 9 Months Ended
Sep. 30, 2021
Equity [Abstract]  
Stockholders' Equity Stockholders' Equity
In September 2021, our board of directors authorized the purchase of up to $500 million, in the aggregate, of our common stock. This new program immediately supersedes the stock purchase program previously approved by our board of directors in September 2020. This new program will be funded with cash on hand and extends through December 31, 2022. The exact timing and amount of any repurchase is determined by management based on market conditions and share price, in addition to other factors, and subject to the restrictions relating to volume, price, and timing under applicable law. As of October 28, 2021, no shares had been purchased under the stock purchase program approved in 2021.
In September 2020, our board of directors authorized the purchase of up to $500 million, in the aggregate, of our common stock. This program was funded with cash on hand. Under this program, pursuant to a Rule 10b5-1 trading
plan, we purchased approximately 577,000 shares for $122 million in January and February 2021 (average cost of $211.65). In November and December 2020, we purchased 766,000 shares of our common stock for $159 million (average cost of $208.37), including approximately 29,000 shares purchased for $6 million in late December 2020, and settled in early January 2021.