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Stockholders' Equity (Narrative) (Details) - USD ($)
shares in Thousands, $ in Millions
9 Months Ended
Oct. 02, 2016
Sep. 27, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock Repurchased and Retired During Period, Shares 600 3,400
Stock repurchased and retired during the period, value $ 23.3 $ 105.2
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 1,600  
Shares Repurchased And Retired Related to Net of Issuances Shares, Shares 99 77
Payments Related to Tax Withholding for net share settlement $ 4.4 $ 2.4