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STOCK-BASED COMPENSATION - Other equity instruments (Details)
12 Months Ended
Jan. 01, 2021
USD ($)
EquityInstruments
shares
Dec. 31, 2020
USD ($)
EquityInstruments
shares
Dec. 31, 2019
USD ($)
EquityInstruments
shares
May 31, 2019
shares
Apr. 30, 2019
shares
ISPP          
Share based compensation          
Percentage of contribution to the plan by participants from their annual salaries   10.00%      
Percentage of contribution to the plan by company on the participants contribution   50.00%      
Total compensation cost   $ 6,900,000 $ 7,700,000    
Number of common shares subscribed | shares   351,086 435,420    
Value of common shares subscribed   $ 20,700,000 $ 23,200,000    
Maximum number of common shares reserved for issuance | shares       8,100,000 7,100,000
Number of awards available for grant | shares   870,369 1,221,455    
RSU          
Share based compensation          
Number of awards granted | EquityInstruments   307,732 409,100    
Fair value at grant date   $ 60.80 $ 40.41    
Amount transferred to an employee benefit trust to be used to purchase common shares of the company in the open market   18,700,000 16,500,000    
Total compensation expense recorded in the general and administrative   $ 21,700,000 $ 17,900,000    
PSU          
Share based compensation          
Vesting period   3 years      
Number of awards granted | EquityInstruments   170,500 196,500    
Fair value at grant date   $ 74.55 $ 47.43    
Amount transferred to an employee benefit trust to be used to purchase common shares of the company in the open market   10,400,000 8,000,000    
Total compensation expense recorded in the general and administrative   $ 12,500,000 $ 12,000,000    
Psu 2018 And 2017 Grant          
Share based compensation          
Amount transferred to an employee benefit trust to be used to purchase common shares of the company in the open market $ 10,200,000        
Number of additional shares purchased under PSU Grant | shares 159,610        
Maximum | RSU          
Share based compensation          
Vesting period   3 years      
Subsequent events | RSU          
Share based compensation          
Number of awards granted | EquityInstruments 317,114        
Subsequent events | PSU          
Share based compensation          
Number of awards granted | EquityInstruments 148,500