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Capital Stock
 12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Capital Stock CAPITAL STOCK
On November 6, 2018, our Board of Directors authorized an additional share repurchase of up to an aggregate market value of $250 million during a three-year period from November 6, 2018 to November 6, 2021. This authorization became fully utilized in September 2021. On April 30, 2021, our Board of Directors authorized us to repurchase an indeterminate number of shares of our common stock at an aggregate market value of up to $500 million with no expiration date.
In the year ended December 31, 2021, we repurchased 4,134,767 shares of our common stock for $225.8 million. In the year ended December 31, 2020, we repurchased 338,521 shares of our common stock for $22.0 million. In the year ended December 31, 2019, we repurchased 443,877 shares of our common stock for $20.0 million. As of December 31, 2021, we had approximately $417.6 million available to us for share repurchase under the $500 million authorization described above.