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Share Plans (Schedule of Share Option Activity) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 25, 2020
Dec. 27, 2019
Dec. 28, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Tax benefit from stock options exercised     $ 0.1  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value     $ 9.66  
Intrinsic value of options vested     $ 0.3  
Share Option Activity [Roll Forward]        
Beginning balance 6,069,712 6,890,700 7,007,051  
Granted     1,378,175  
Exercised     (45,324)  
Expired/Forfeited (516,193) (820,988) (1,449,202)  
Ending balance 5,553,519 6,069,712 6,890,700  
Share options vested and unvested expected to vest 5,352,763      
Share options exerciseable 4,616,911      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]        
Weighted-average exercise price, outstanding share options $ 35.05 $ 35.95 $ 36.39 $ 38.74
Weighted-average exercise price, granted share options     22.09  
Weighted-average exercise price, exercised share options     20.67  
Weighted-average exercise price, expired and forfeited share options 45.63 $ 39.65 $ 34.80  
Weighted-average exercise price, vested and unvested expected to vest share options 35.14      
Weighted-average exercise price, exercisable share options $ 38.56      
Weighted-average remaining contractual term, outstanding share options 1 year 8 months 12 days      
Weighted-average remaining contractual term, vested and unvested expected to vest share options 5 years 6 months      
Weighted-average remaining contractual term, exercisable share options 2 years      
Aggregate intrinsic value, outstanding share options $ 0.0      
Aggregate intrinsic value, vested and unvested expected to vest share options 0.0      
Aggregate intrinsic value, exercisable share options $ 0.0      
Tax benefit from stock options exercised     $ 0.1