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Capital Stock	6 Months Ended
	Jun. 30, 2021
Equity [Abstract]
Capital Stock	Capital StockFor the three and six months ended June 30, 2021, the Company repurchased less than 0.1 million shares of common stock for $1 million and approximately 0.7 million shares of common stock for $68 million, respectively. For the three and six months ended June 30, 2020, the Company repurchased less than 0.1 million shares of common stock for less than $1 million and approximately 0.8 million shares of common stock for $60 million, respectively. Repurchases include both share repurchase programs approved by the Board of Directors and repurchases in relation to settlement of employee tax withholding obligations due as a result of the vesting of restricted stock units. The details of repurchases by each program are as follows: On August 24, 2015, our Board of Directors authorized the repurchase of up to $500 million in shares with no expiration date. The program's objective is to deploy our capital in a manner that benefits our shareholders and maintains our focus on growth. There were no shares repurchased under the program for the three months ended June 30, 2021. For the six months ended June 30, 2021, we repurchased approximately 0.6 million shares for $60 million. There were no shares repurchased under the program for the three months ended June 30, 2020. For the six months ended June 30, 2020, we repurchased approximately 0.7 million shares for $50 million. There are up to $228 million in shares that may still be purchased under this plan as of June 30, 2021. Aside from the aforementioned repurchase program, we repurchased less than 0.1 million shares and approximately 0.1 million shares for $1 million and $8 million for the three and six months ended June 30, 2021, respectively, in relation to settlement of employee tax withholding obligations due as a result of the vesting of restricted stock units. Likewise, we repurchased less than 0.1 million shares and approximately 0.1 million shares for less than $1 million and $10 million for the three and six months ended June 30, 2020, respectively.

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- Definition

The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-URI http://asc.fasb.org/subtopic&trid=2208821

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