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Stockholders' Equity Repurchase Program (Details) - USD ($)
9 Months Ended
Sep. 30, 2015
Apr. 14, 2014
Stockholders' Equity Note [Abstract]    
Stock repurchase program, authorized amount   $ 500,000,000
Stock repurchased during period, shares 520,600  
Stock repurchased during period $ 95,000,000  
Stock repurchase program, remaining authorized repurchase amount $ 380,000,000