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Stockholders' Equity Repurchase Program (Details) - USD ($)
3 Months Ended
Mar. 31, 2016
Apr. 18, 2016
Apr. 14, 2014
Equity, Class of Treasury Stock [Line Items]      
Stock repurchase program, remaining authorized repurchase amount $ 0    
Common Stock | Share Repurchase Program 2014      
Equity, Class of Treasury Stock [Line Items]      
Stock repurchase program, authorized amount     $ 500,000,000
Stock repurchased during period (shares) 1,507,100    
Stock repurchased during period $ 225,000,000    
Common Stock | Share Repurchase Program 2016 | Subsequent Event      
Equity, Class of Treasury Stock [Line Items]      
Stock repurchase program, authorized amount   $ 1,000,000,000