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CONTRIBUTING EMPLOYEE OWNERSHIP PLAN (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Defined Contribution Plan Disclosure [Line Items]            
Defined Contribution Plan Employer Contribution of Eligible Compensation   $ 9.3 $ 6.5 $ 26.6 $ 21.5  
Employer matching contributions to employee ownership plan   $ 3.5 $ 0.8 $ 10.4 $ 2.3  
Employer contributions to employee ownership plan           $ 0.0
Minimum            
Defined Contribution Plan Disclosure [Line Items]            
Contribution To Individual Retirement Account Percentage Of Employees Eligible Compensation   5.00%   5.00%    
Maximum            
Defined Contribution Plan Disclosure [Line Items]            
Contribution To Individual Retirement Account Percentage Of Employees Eligible Compensation   7.50%   7.50%    
Defined Contribution Plan, Employer Matching Contribution, Percent of Match 3.00%