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STOCK-BASED COMPENSATION (Restricted Stock and Restricted Stock Units Additional Information) (Details) - USD ($)
shares in Thousands, $ in Millions
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Restricted Stock Units (RSU) | PolSource S.A.    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Shares issued in period (in shares) 6  
Restricted Stock Units (RSU) | 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  
Service Period | Equity Classified Award | Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Remaining unrecognized stock-based compensation cost $ 0.5  
Weighted-average remaining requisite service period 10 months 24 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 $ 116.1  
Weighted-average remaining requisite service period 2 years 9 months 18 days  
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) 29  
Service Period | Equity Classified Award | Restricted Stock Units (RSU) | CORE SE    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards granted (in shares) 3  
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) 14  
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) 221  
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 $ 39.1  
Weighted-average remaining requisite service period 2 years 4 months 24 days  
Awards granted (in shares) 27  
Performance Target | Equity-Settled Award | CORE SE    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Weighted-average remaining requisite service period 3 years 4 months 24 days  
Number of shares available for grant 34,900  
Performance Target | Equity-Settled Award | Restricted Stock Units (RSU)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Awards vesting period 2 years  
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) 2  
Performance Target | Equity Classified Award | Restricted Stock    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Remaining unrecognized stock-based compensation cost $ 0.7  
Weighted-average remaining requisite service period 1 year 10 months 24 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 $ 1.8  
Weighted-average remaining requisite service period 2 years  
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 $ 20.4 $ 26.8