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RESTRUCTURING - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Restructuring Cost and Reserve [Line Items]        
Total charges $ 17.9 $ 15.3 $ 68.0 $ 15.3
Employee Severance        
Restructuring Cost and Reserve [Line Items]        
Estimated restructuring expenses remaining (percent) 40.00%   40.00%  
Minimum        
Restructuring Cost and Reserve [Line Items]        
Estimated restructuring expenses remaining $ 60.0   $ 60.0  
Maximum        
Restructuring Cost and Reserve [Line Items]        
Estimated restructuring expenses remaining $ 85.0   $ 85.0