Goodwill and Other Intangible Assets - Additional (Details) - USD ($) $ in Millions	Jun. 18, 2019	Jan. 02, 2019	Jun. 30, 2019
WTOL and KWES
Business Acquisition [Line Items]
Estimated transaction price		$ 109.9
Final working capital adjustment		1.0
Consideration transferred		108.9
Working capital adjustment		$ 3.9
Finite-lived intangible assets, remaining amortization period		7 years
Goodwill, acquired during period		$ 11.5
Justice Network And Quest
Business Acquisition [Line Items]
Consideration transferred	$ 77.2
Working capital adjustment	4.7
Goodwill, acquired during period	$ 27.5
Ownership interest (as a percent)	85.00%		85.00%
Gain recognized due to write-up of prior investment	$ 7.3
Licensing Agreements | WTOL and KWES
Business Acquisition [Line Items]
Indefinite-lived intangible assets acquired		53.4
Retransmission And Network Affiliation Agreements | WTOL and KWES
Business Acquisition [Line Items]
Finite-lived intangible assets acquired		$ 28.4
Distribution Agreements | Justice Network And Quest
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	44.1
Trade Names | Justice Network And Quest
Business Acquisition [Line Items]
Finite-lived intangible assets acquired	$ 4.7