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COMMITMENTS AND CONTINGENCIES (NARRATIVE) (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Mar. 25, 2021
USD ($)
Apr. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Line of Credit Facility, Expiration Date         Feb. 14, 2024    
Line of Credit Facility, Increase (Decrease), Other, Net   $ 300,000,000          
Line of Credit Facility, Current Borrowing Capacity   $ 1,200,000,000          
Initial Borrowing Capacity $ 1,200,000     $ 1,200,000 $ 1,200,000    
Proceeds from factored receivables 75,000,000     75,000,000 75,000,000    
Percentage of receivables factored 25     $ 25 $ 25    
Credit facility interest rate       1.30%      
Line of Credit Facility, Collateral         Letter of credit fees are one eighth of 1% of the stated amount of the letter of credit on the date of issuance, renewal or amendment, plus an annual fee equal to the borrowing margin for Eurodollar loans.    
Borrowings outstanding on credit facility 805,000,000     $ 805,000,000 $ 805,000,000   $ 385,000,000
Line of credit 805,000,000     805,000,000 805,000,000   $ 385,000,000
Average daily utilization under credit facility         747,900,000 $ 597,900,000  
Remaining borrowing capacity under credit facility 390,000,000     390,000,000 390,000,000    
Letters Of Credit Issued Outside Line Of Credit Facility 400,000     400,000 400,000    
Line Of Credit Facility Letters Of Credit Issued $ 2,600,000     $ 2,600,000 $ 2,600,000    
Fed Funds Effective Rate Overnight Index Swap Rate [Member]              
Credit facility interest rate 0.50%            
London Interbank Offered Rate (LIBOR) [Member]              
Credit facility interest rate 1.25%            
Avtex              
Line of Credit Facility, Increase (Decrease), Other, Net     $ 500,000,000        
Minimum | Interest coverage ration [Member]              
Ratio of Indebtedness to Net Capital 2.50     2.50 2.50    
Minimum | Company's net leverage ratio [Member]              
Credit facility interest rate 0.00%            
Minimum | Eurodollar [Member]              
Credit facility interest rate 1.00%            
Maximum              
Ratio of Indebtedness to Net Capital 3.50     3.50 3.50    
Proceeds from factored receivables $ 75,000,000     $ 75,000,000 $ 75,000,000    
Maximum | Company's net leverage ratio [Member]              
Credit facility interest rate 0.875%            
Maximum | Eurodollar [Member]              
Credit facility interest rate 1.875%