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INDEBTEDNESS - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Aug. 21, 2020
Long-term debt            
Repayments of term loans     $ 62.2 $ 12.8    
Loss on extinguishment of debt $ 0.2 $ 0.4 0.2 0.4    
Borrowings under line of credit     340.5 $ 350.5    
Credit Agreement | Credit Facility | Base rate            
Long-term debt            
Borrowings under line of credit         $ 10.0  
Basis spread on variable rate         5.25%  
Credit Agreement | Credit Facility | LIBOR            
Long-term debt            
Borrowings under line of credit     $ 59.0   $ 128.5  
Basis spread on variable rate     1.90%   3.27%  
Credit Agreement | Letter of Credit            
Long-term debt            
Interest rate 1.75%   1.75%   1.50%  
Amended Credit Agreement | Term loan            
Long-term debt            
Repayments of term loans     $ 50.0      
Debt issuance costs           $ 0.3
Loss on extinguishment of debt     $ 0.2      
Interest rate 1.90%   1.90%   3.30%  
Amended Credit Agreement | Multi-currency term loans            
Long-term debt            
Interest rate 1.75%   1.75%   1.50%