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FINANCING ARRANGEMENTS - Narrative (Details)
1 Months Ended 9 Months Ended
Dec. 17, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Jun. 03, 2021
USD ($)
Dec. 31, 2020
USD ($)
Aug. 27, 2013
USD ($)
Debt Instrument [Line Items]            
Long-term debt   $ 1,725,950,000 $ 1,725,950,000   $ 1,093,301,000  
Revolving credit facility | Line of credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity   $ 1,000,000,000 $ 1,000,000,000      
Maximum leverage ratio   3.50 3.50      
Long-term debt   $ 632,000,000 $ 632,000,000   0  
Revolving credit facility | Line of credit | Federal Funds Rate            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)     0.50%      
Revolving credit facility | Line of credit | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent)     1.13%      
Revolving credit facility | Line of credit | Minimum            
Debt Instrument [Line Items]            
Commitment fee (percent)     0.075%      
Revolving credit facility | Line of credit | Maximum            
Debt Instrument [Line Items]            
Commitment fee (percent)     0.20%      
Combinex credit facility | Line of credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity       $ 3,600,000    
Repayment on credit facility   2,200,000        
US Bank | Line of credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity   15,000,000 $ 15,000,000      
US Bank | Standby letters of credit            
Debt Instrument [Line Items]            
Line of credit utilized for standby letters of credit related to insurance collateral   $ 8,000,000 $ 8,000,000      
Note Purchase Agreement | Senior notes            
Debt Instrument [Line Items]            
Maximum leverage ratio   3.00 3.00      
Minimum interest coverage ratio     2.00      
Debt instrument principal amount           $ 500,000,000
Long-term debt, fair value   $ 546,000,000 $ 546,000,000      
Maximum priority debt to total assets ratio (percent)     15.00%      
Debt instrument, redemption price (percent)     100.00%      
Senior Notes Due 2028 | Unsecured debt            
Debt Instrument [Line Items]            
Long-term debt, fair value   $ 680,200,000 $ 680,200,000      
Debt instrument, redemption price (percent)     101.00%      
Debt instrument, annual interest rate (percent)   4.20% 4.20%      
Long-term debt   $ 593,950,000 $ 593,950,000   $ 593,301,000  
Debt instrument, effective yield (percent)   4.39% 4.39%      
Threshold for holders of principal outstanding to declare principal and unpaid interest payable (percent)     25.00%      
Receivables securitization facility | Secured debt            
Debt Instrument [Line Items]            
Maximum borrowing capacity $ 250,000,000          
Receivables securitization facility | Secured debt | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate (percent) 0.65%