Revenue - Broadcasting Segment Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenue	$ 383.4	$ 362.5
Net revenue	444.8	449.0
Broadcasting
Segment Reporting Information [Line Items]
Revenue	10.1	9.8
Other revenue	0.0	0.0
Net revenue	10.1	9.8
Network advertising \| Broadcasting
Segment Reporting Information [Line Items]
Revenue	5.0	5.4
Broadcast station \| Broadcasting
Segment Reporting Information [Line Items]
Revenue	3.5	2.7
Network distribution \| Broadcasting
Segment Reporting Information [Line Items]
Revenue	1.0	1.5
Other \| Broadcasting
Segment Reporting Information [Line Items]
Revenue	$ 0.6	$ 0.2

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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