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DISPOSITIONS AND RESTRUCTURING - Restructuring Activities (Details) - Employee Related Costs - Partnership - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Business Acquisition [Line Items]      
Severance costs     $ 3.3
Restructuring costs $ 0.1 $ 3.4  
Cash payment   6.4  
Employee related cost included in other current liabilities $ 0.3 $ 0.3