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Stockholders' Equity Stockholders' Equity (Notes)	6 Months Ended
Stockholders' Equity Stockholders' Equity (Notes)	Jun. 30, 2018
Stockholders' Equity Attributable to Parent [Abstract]
Stockholders' Equity Note Disclosure [Text Block]	— Stockholders’ Equity Share Repurchase Program On May 2, 2018, the Company announced that our Board of Directors authorized a Share Repurchase Program (the “Repurchase Program”) to repurchase up to $500 million of our common stock. Repurchases may be made at the Company’s discretion from time to time on the open market or in privately negotiated transactions. The Repurchase Program has no time limit, does not obligate the Company to make any repurchases, and may be suspended for periods or discontinued at any time. Any shares acquired are available for general corporate purposes. During the three and six months ended June 30, 2018, we repurchased approximately 2.7 million shares for approximately $31 million under the program recorded in Treasury stock.