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GOODWILL AND OTHER INTANGIBLE ASSETS - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]              
Goodwill, impairment loss   $ 0 $ 0 $ 0      
Impairment of Indefinite-lived Intangible assets $ 0            
Amortization expense related to purchased intangible assets         $ 141,800,000 $ 140,100,000 $ 152,800,000