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Stockholders' Equity (Common Stock Repurchase Activity) (Details) - USD ($)
shares in Millions
 12 Months Ended 61 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Dec. 31, 2017
Equity, Class of Treasury Stock [Line Items]      
Number of Shares Repurchased (in shares)     11.8
2014 Authorization      
Equity, Class of Treasury Stock [Line Items]      
Dollar Value Authorized $ 1,000,000,000.0    
Number of Shares Repurchased (in shares) 0.0 0.1  
Dollar Value Repurchased $ 0 $ 5,200,000  
Repurchase program authorized in 2010      
Equity, Class of Treasury Stock [Line Items]      
Dollar Value Authorized $ 30,000,000    
Number of Shares Repurchased (in shares) 0.0 0.0  
Dollar Value Repurchased $ 0 $ 0