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Capital Stock	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Capital Stock	Capital Stock For the three months ended March 31, 2018 the Company repurchased approximately 0.4 million shares for $33 million. 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 detail 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. For the three months ended March 31, 2018, we repurchased approximately 0.3 million shares for $25 million. There were no shares repurchased under this program for the three months ended March 31, 2017. There are up to $388 million in shares that may still be purchased under this plan as of March 31, 2018. Aside from the aforementioned repurchase programs, we repurchased approximately 0.1 million shares and 0.1 million shares for $8 million and $5 million for the three months ended March 31, 2018 and 2017, respectively, in relation to settlement of employee tax withholding obligations due as a result of the vesting of restricted stock units.

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- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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