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Stockholders' Equity
3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Stockholders' Equity Stockholders' Equity
Share Repurchases
In November 2012, our Board of Directors authorized a share repurchase program. In February 2017, our Board of Directors increased the amount that we are authorized to expend on future repurchases to $1,000.0 under our repurchase program, which superseded all prior repurchase programs. The entire amount authorized pursuant to this February 2017 Board approval has been utilized. On October 22, 2019, the Board of Directors approved a share repurchase authorization of up to $1,000.0. On July 28, 2020, the Board of Directors approved a new share repurchase authorization of up to an additional $1,500.0. The repurchase program does not have an expiration date and we are not obligated to acquire a particular number of shares. The repurchase program may be discontinued at any time at our discretion. We did not repurchase shares of our common stock during the three months ended March 31, 2021. Under the program, we repurchased 1.3 shares of our common stock at a cost of $107.1 during the three months ended March 31, 2020. As of March 31, 2021, there is a total of $2,024.7 remaining for repurchases under the repurchase programs.