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Investments (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2018
Feb. 26, 2018
Jan. 05, 2018
Dec. 31, 2017
Investments [Line Items]        
Equity Method Investments $ 81.4     $ 61.3
Cost Method Investments $ 71.8     $ 46.8
RLJE Stock Purchase Agreement [Member]        
Investments [Line Items]        
Warrants Received per RLJE Investment Agreement     747,945  
Investment Warrants, Exercise Price $ 1.50      
Business Acquisition, Transaction Costs     $ 17.2  
RLJE [Member]        
Investments [Line Items]        
Investment Warrants, Exercise Price $ 3.00      
Business Acquisition, Share Price   $ 4.25    
fuboTV [Member]        
Investments [Line Items]        
Cost Method Investments $ 25.0      
Common Class A [Member] | RLJE Stock Purchase Agreement [Member]        
Investments [Line Items]        
Common Stock Of RLJE Acquired, Number Of Shares     678,095  
Convertible Preferred Stock [Member] | RLJE Stock Purchase Agreement [Member]        
Investments [Line Items]        
Common Stock Of RLJE Acquired, Number Of Shares     7,479.432