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Share Plans (Schedule of Performance Share Unit Activity) (Details) - $ / shares
12 Months Ended
Dec. 27, 2019
Dec. 28, 2018
Dec. 29, 2017
Dec. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Performance Shares Award, Performance Period 3 years      
Performance Shares        
Performance Share Unit Activity [Roll Forward]        
Beginning balance [1] 1,161,529 504,451 265,648  
Granted 448,363 770,714 348,963  
Exercised [1]   (24,022) (61,554)  
Expired/Forfeited [1] (414,387) (89,614) (48,606)  
Ending balance [1] 1,195,505 1,161,529 504,451  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Weighted-average grant date fair value, restricted share units $ 23.85 $ 28.61 $ 64.44 $ 88.51
Weighted-average grant date fair value, granted restricted share units 32.46 13.80 51.73  
Weighted-average grant date fair value, vested restricted share units   98.27 62.65  
Weighted-average grant date fair value, forfeited restricted share units $ 30.54 $ 59.18 $ 107.00  
Restricted Share Units        
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, Outstanding, Weighted Average Remaining Contractual Terms 1 year 9 months 18 days      
Weighted-average period to recognize unrecognized compensation cost, share options 2 years 3 months 18 days      
Performance Share Unit Activity [Roll Forward]        
Beginning balance 1,685,101 1,105,766 883,462  
Granted 755,180 1,222,568 655,282  
Exercised (713,274) (433,354) (263,189)  
Expired/Forfeited (307,987) (209,879) (169,789)  
Ending balance 1,419,020 1,685,101 1,105,766  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]        
Weighted-average grant date fair value, restricted share units $ 22.68 $ 29.54 $ 60.08 $ 71.03
Weighted-average grant date fair value, granted restricted share units 20.13 14.58 50.74  
Weighted-average grant date fair value, vested restricted share units 35.29 57.93 69.14  
Weighted-average grant date fair value, forfeited restricted share units $ 24.81 $ 44.38 $ 68.57  
Award Vesting Period 4 years      
[1] The number of shares disclosed within this table are at the target number of 100.0%.