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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2021
Sep. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Indefinite-lived Intangible Assets [Line Items]                    
Goodwill   $ 2,313,824,000       $ 2,313,824,000 $ 2,313,824,000   $ 2,145,935,000 $ 3,325,622,000
Annual intangible assets impairment test, forecast period             10 years      
Impairment of intangible assets, indefinite-lived             $ 0      
Impairment of definite-lived intangibles         $ 0          
Total amortization expense related to definite-lived intangible assets   $ 64,300,000   $ 64,500,000     $ 218,000,000 $ 193,000,000    
Goodwill impairment     $ 0   1,200,000,000 $ 0     $ 1,224,374,000  
FCC Licenses                    
Indefinite-lived Intangible Assets [Line Items]                    
Impairment of intangible assets, indefinite-lived         $ 502,700,000          
Triton Digital                    
Indefinite-lived Intangible Assets [Line Items]                    
Consideration transferred for acquisition $ 228,500,000                  
Assets acquired 69,400,000   69,400,000              
Intangible assets acquired 191,500,000   191,500,000              
Goodwill 168,200,000   168,200,000              
Tax-deductible goodwill 6,900,000   6,900,000              
Liabilities assumed $ 32,400,000   $ 32,400,000