Acquisitions and Dispositions (Details) - Disposal Group, Disposed of by Sale, Not Discontinued Operations - USD ($) $ in Millions		3 Months Ended	6 Months Ended
	Mar. 01, 2020	Jun. 30, 2020	Jun. 30, 2020	Jun. 24, 2020	Dec. 31, 2019
DC Land
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash received for sale				$ 71.3	$ 5.0
Loss on sale		$ 3.7	$ 3.7
WABC-AM
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash received for sale	$ 12.0
Loss on sale	$ 0.9