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STOCK-BASED COMPENSATION (Restricted Stock and Restricted Stock Units Additional Information) (Details) - USD ($)
shares in Thousands, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2021
Dec. 31, 2020
Restricted Stock | Other 2021 acquisitions      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued in period (in shares)   3,800  
Issuance period   12 months  
Restricted Stock Units (RSU) | PolSource S.A.      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued in period (in shares)   17  
Restricted Stock Units (RSU) | Other 2021 acquisitions      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued in period (in shares)   1  
Service Period | Equity Classified Award | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Remaining unrecognized stock-based compensation cost $ 0.6 $ 0.6  
Weighted-average remaining requisite service period   1 year 2 months 12 days  
Service Period | Equity Classified Award | Restricted Stock Units (RSU)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Remaining unrecognized stock-based compensation cost $ 121.8 $ 121.8  
Weighted-average remaining requisite service period   3 years  
Service Period | Equity Classified Award | Restricted Stock Units (RSU) | PolSource S.A.      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 17    
Service Period | Equity Classified Award | Restricted Stock Units (RSU) | Other 2021 acquisitions      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 11    
Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares)   0  
Service Period | Equity Classified Award | Equity-Settled Award | Restricted Stock Units (RSU)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares)   200  
Service Period | Liability Classified Award | Cash-Settled Award | Restricted Stock Units (RSU)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Remaining unrecognized stock-based compensation cost $ 41.0 $ 41.0  
Weighted-average remaining requisite service period   2 years 6 months  
Awards granted (in shares)   26  
Performance Target | Equity-Settled Award | Restricted Stock Units (RSU) | PolSource S.A.      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 1    
Shares issued in period (in shares) 5    
Performance Target | Equity-Settled Award | Restricted Stock Units (RSU) | Other 2021 acquisitions      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares) 1    
Performance Target | Equity Classified Award | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Remaining unrecognized stock-based compensation cost $ 0.8 $ 0.8  
Weighted-average remaining requisite service period   2 years 2 months 12 days  
Performance Target | Equity Classified Award | Restricted Stock Units (RSU)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Remaining unrecognized stock-based compensation cost 2.8 $ 2.8  
Weighted-average remaining requisite service period   2 years 2 months 12 days  
Performance Target | Equity Classified Award | Equity-Settled Award | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares)   0  
Performance Target | Equity Classified Award | Equity-Settled Award | Restricted Stock Units (RSU)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards granted (in shares)   1  
Accrued compensation and benefits expenses | Service Period | Liability Classified Award | Cash-Settled Award | Restricted Stock Units (RSU)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Liability associated with RSUs $ 13.3 $ 13.3 $ 26.8