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Stockholders' Equity - Share Repurchase Program (Details) - Accelerated stock repurchase program (ASR) - USD ($)
shares in Millions, $ in Millions
Jul. 27, 2015
Mar. 31, 2015
Feb. 27, 2015
Share Repurchase Program      
Common stock repurchase authorized amount     $ 75
Additional Shares Delivered Under Share Repurchase Program 0.0    
Minimum      
Share Repurchase Program      
Number of shares authorized to be repurchased   1.5