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Goodwill and Intangibles, net - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]          
FCC license decrease     $ 6.9    
Amortization expense $ 2.0 $ 2.9 6.0 $ 8.9  
Negative amortization $ 28.6   $ 28.6   $ 22.5