Goodwill and Intangibles, net - Indefinite-lived Intangible Assets (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 107.5	$ 113.0
FCC licenses
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	107.5	113.0
Other
Acquired Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	$ 0.0	$ 0.0