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Goodwill and Intangibles, net - Indefinite-lived Intangible Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2019
Dec. 31, 2018
Acquired Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets $ 135.1 $ 123.1
FCC licenses    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 132.6 120.6
State licenses    
Acquired Indefinite-lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets $ 2.5 $ 2.5