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Share Plans (Tables)
 12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
Maximum Number of Common Shares to be Issued as Awards The maximum number of common shares to be issued as Awards, subject to adjustment as provided under the terms of the respective plans were as follows:
Maximum Number of Common Shares to be Issued as Awards (in millions)
2013 Plan5.7 
2015 Plan17.8 
2018 Plan26.8 
Schedule of Share Option Activity
Share option activity and information was as follows:
Share OptionsWeighted-Average Exercise PriceWeighted-Average Remaining Contractual Term
(in years)		Aggregate Intrinsic Value
Outstanding as of December 28, 20187,007,051 $38.74 
Granted1,378,175 22.09 
Exercised(45,324)20.67 
Expired/Forfeited(1,449,202)34.80 
Outstanding as of December 27, 20196,890,700 36.39 
Expired/Forfeited(820,988)39.65 
Outstanding as of December 25, 20206,069,712 35.95 
Expired/Forfeited(516,193)45.63 
Outstanding as of December 31, 20215,553,519 35.05 1.7$— 
Vested and non-vested expected to vest as of December 31, 20215,352,763 35.14 5.5$— 
Exercisable as of December 31, 20214,616,911 38.56 2.0— 
Schedule of the Valuation Assumptions Used in the Conversion The weighted-average assumptions used in the Black-Scholes pricing model for shares granted in fiscal 2019, along with the weighted-average grant-date fair value, were as follows:
Expected share price volatility45.8 %
Risk-free interest rate2.2 %
Expected annual dividend per share— %
Expected life of options (in years)5.3
Fair value per option$9.66 
Schedule of Restricted Share Unit Activity
RSU activity was as follows:
SharesWeighted-Average
Grant-Date Fair Value
Non-vested as of December 28, 20181,685,101 $29.54 
Granted755,180 20.13 
Exercised(713,274)35.29 
Expired/Forfeited(307,987)24.81 
Non-vested as of December 27, 20191,419,020 22.68 
Exercised(647,167)24.23 
Expired/Forfeited(281,182)22.11 
Non-vested as of December 25, 2020490,671 20.96 
Exercised(186,930)23.43 
Expired/Forfeited(60,844)19.58 
Non-vested as of December 31, 2021242,897 19.40 
Share-based Compensation, Performance Shares Award Outstanding Activity
PSU activity was as follows (1):
SharesWeighted-Average
Grant-Date Fair Value
Non-vested as of December 28, 20181,161,529 $28.61 
Granted448,363 32.46 
Forfeited(414,387)30.54 
Non-vested as of December 27, 20191,195,505 23.85 
Forfeited(1,195,505)23.85 
Non-vested as of December 25, 2020— — 
(1)    The number of shares disclosed within this table are at the target number of 100.0%.
Schedule of Share-based Payment Award, Performance Share Awards, Valuation Assumptions The assumptions used in the Monte Carlo model for PSUs granted during fiscal 2019 were as follows:
Expected stock price volatility55.2 %
Peer group stock price volatility41.3 
Correlation of returns47.8