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PROPERTY, PLANT AND EQUIPMENT, INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Indefinite-lived Intangible Assets [Line Items]                  
Goodwill   $ 2,313,425,000       $ 2,313,425,000   $ 2,145,935,000 $ 3,325,622,000
Impairment of intangibles         $ 0        
Total amortization expense related to definite-lived intangible assets   $ 87,400,000   $ 64,300,000   $ 153,700,000 $ 128,600,000    
Goodwill impairment     $ 0   1,200,000,000     $ 1,224,374,000  
FCC Licenses                  
Indefinite-lived Intangible Assets [Line Items]                  
Impairment of FCC licenses         $ 502,700,000        
Triton Digital                  
Indefinite-lived Intangible Assets [Line Items]                  
Consideration transferred for acquisition $ 228,500,000                
Assets acquired 69,700,000   69,700,000            
Intangible assets acquired 191,200,000   191,200,000            
Goodwill 167,900,000   167,900,000            
Tax-deductible goodwill 6,900,000   6,900,000            
Liabilities assumed $ 32,400,000   $ 32,400,000