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Goodwill and Intangibles, net - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Acquired Indefinite-lived Intangible Assets [Line Items]        
Amortization expense $ 3.1 $ 1.1 $ 6.3 $ 2.1
FCC licenses        
Acquired Indefinite-lived Intangible Assets [Line Items]        
Increase in licenses     12.0  
Increase in licenses through acquisitions     12.9  
Impairments of intangible assets     $ 0.9