Goodwill and Intangibles, net - Indefinite-lived Intangible Assets (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 139.1	$ 138.7
FCC licenses
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	136.6	136.2
State licenses
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 2.5	$ 2.5