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Employee Stock Benefit Plans (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options $ 129.1    
Total unamortized compensation expense weighted-average recognition period, in years 2 years 9 months 6 days    
Options, Grants in Period 100,000 0  
Total intrinsic value of options exercised $ 30.0 $ 41.1 $ 36.0
Weighted average grant-date fair value of stock options granted $ 10.62   $ 6.03
Fair Value of Stock Options Vested $ 1.9 $ 6.5 $ 14.6
Common Stock, Shares Authorized 360,000,000.0 360,000,000.0  
Stock Issued During Period, Shares, Employee Stock Purchase Plans 800,000 800,000 1,100,000
Stock Issued During Period, Value, Employee Stock Purchase Plan $ 24.0 $ 20.4 $ 19.1
Two Thousand Two Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Maximum number of shares authorized for grant 74,600,000    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 12,700,000    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period [1] 2,700,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 2,500,000    
Weighted Average Grant-Date Fair Value, Granted $ 37.43 [1] $ 40.19 $ 26.13
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value $ 73.9 $ 40.4 $ 33.6
Restricted Stock Units (RSUs) [Member] | Two Thousand Two Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Grants Shares Per Unit on Plan Reserve 1.69    
Share units granted vesting period, in years 4 years    
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common Stock, Shares Authorized 39,000,000.0    
Percentage of lower fair market value to be purchased of common stock through payroll deductions 85.00%    
Employee stock options granted term, in months 6 months    
Common Stock, Capital Shares Reserved for Future Issuance 8,200,000    
Employee Stock Option [Member] | Two Thousand Two Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share units granted vesting period, in years 4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 7 years    
Market Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 500,000    
Market-based and Performance-based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding, Number 1,500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 700,000    
Market-based and Performance-based Restricted Stock Units [Member] | Two Thousand Two Stock Plan [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share units granted vesting period, in years 2 years    
Market-based and Performance-based Restricted Stock Units [Member] | Two Thousand Two Stock Plan [Member] | Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share units granted vesting period, in years 3 years    
Time Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 2,000,000    
Performance-Based Restricted Stock Units [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 200,000    
[1] During fiscal year 2018, the Company granted approximately 2.0 million time-based RSUs, 0.2 million PRSUs and 0.5 million market-based RSUs. As of fiscal year end 2018, the Company has 1.5 million market-based RSUs and PRSUs outstanding. 0.7 million were vested as of fiscal 2018 year end.