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EMPLOYEE BENEFIT PLANS (Additional Information) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]      
Maximum age to receive health care coverage 65 years    
Accumulated benefit obligation $ 281.5 $ 228.0  
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Required service period for employee participation 30 days    
Basic contributions as a percentage of annual salary 50.00%    
Company matching contribution, percent of match 200.00%    
Company matching contribution, percent of employees' annual pay 3.00%    
Contribution to the qualified defined contribution plans $ 32.7 $ 27.5 $ 26.3
Estimated future contributions in 2019 $ 55.3    
Pension Benefits [Member] | Equity Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan asset allocations   54.00%  
Pension Benefits [Member] | Fixed Income Securities [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan asset allocations   40.00%  
Pension Benefits [Member] | Real Estate [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Plan asset allocations 6.00%