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Investments (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Sep. 30, 2018	Oct. 31, 2018	Oct. 30, 2018	Oct. 01, 2018	Jul. 29, 2018	Mar. 05, 2018	Jan. 05, 2018	Dec. 31, 2017	Oct. 14, 2016
Investments [Line Items]
Equity Method Investments	$ 103.2		$ 103.2							$ 61.3
Marketable Securities	5.3		5.3							10.7
Securities Owned Not Readily Marketable	71.8		$ 71.8							$ 46.8
Equity Method Investment, Other than Temporary Impairment	$ 3.5	$ 10.0
Common Class A [Member]
Investments [Line Items]
Common stock, par value	$ 0.01		$ 0.01							$ 0.01
RLJE Stock Purchase Agreement [Member]
Investments [Line Items]
Warrants Received per RLJE Investment Agreement									747,945
Class of Warrant or Right, Exercise Price of Warrants or Rights									$ 1.50
Business Acquisition, Transaction Costs									$ 17.2
RLJE Stock Purchase Agreement [Member] \| Common Class A [Member]
Investments [Line Items]
Common Stock Of RLJE Acquired, Number Of Shares									678,095
RLJE Stock Purchase Agreement [Member] \| Convertible Preferred Stock [Member]
Investments [Line Items]
Common Stock Of RLJE Acquired, Number Of Shares									7,479.432
RLJE [Member]
Investments [Line Items]
Warrants Received per RLJE Investment Agreement											20,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights											$ 3.00
Business Acquisition, Share Price							$ 6.25
Preferred Stock Cash Consideration Per Share of Common Stock							7.86
RLJE [Member] \| Subsequent Event [Member]
Investments [Line Items]
Business Acquisition, Transaction Costs				$ 58.9
Business Acquisition, Percentage of Voting Interests Acquired				17.00%		51.00%
Debt Instrument, Face Amount				$ 28.0
Additional Term Loans Permitted				$ 12.0
Debt Instrument, Interest Rate, Stated Percentage				7.00%
RLJE [Member] \| Subsequent Event [Member] \| Term Loan Principal Increase [Member]
Investments [Line Items]
Debt Instrument, Face Amount				$ 5.0
RLJE [Member] \| Class A [Member] \| Subsequent Event [Member]
Investments [Line Items]
Common Stock Of RLJE Acquired, Number Of Shares						3,300,000
Class of Warrant or Right, Exercise Price of Warrants or Rights						$ 3.00
Cancellation of Tranche B Term Loans						$ 10.0
RLJE [Member] \| Class B [Member] \| Subsequent Event [Member]
Investments [Line Items]
Common Stock Of RLJE Acquired, Number Of Shares					6,600,000	3,400,000
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 3.00	$ 3.00
Cancellation of Tranche B Term Loans					$ 19.9	$ 10.1
RLJE [Member] \| Class C [Member] \| Subsequent Event [Member]
Investments [Line Items]
Common Stock Of RLJE Acquired, Number Of Shares					5,000,000
Class of Warrant or Right, Exercise Price of Warrants or Rights					$ 3.00
Cancellation of Tranche B Term Loans					$ 15.0
RLJE [Member] \| Common Class A [Member]
Investments [Line Items]
Common stock, par value							$ 0.001
fuboTV [Member]
Investments [Line Items]
Securities Owned Not Readily Marketable								$ 25.0
Payments to Acquire Loans Receivable			$ 25.0