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Organization and Summary of Significant Accounting Policies (Narrative) (Details)
member in Millions, $ in Millions
12 Months Ended
Jul. 14, 2015
Jun. 30, 2015
Dec. 31, 2017
USD ($)
country
segment
member
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Organization And Summary Of Significant Accounting Policies [Line Items]          
Number of streaming members (more than) | member     117    
Number of countries (over) | country     190    
Number of hours (more than)     140000000 hours    
Number of reportable segments | segment     3    
Stock split, conversion ratio 7 7      
Streaming content library, useful life (in years)     1 year    
Advertising expense     $ 1,091.1 $ 842.4 $ 714.3
Technology and development     981.3 768.3 570.0
Foreign currency translation adjustment, other comprehensive loss         21.8
Foreign currency transaction gain (loss)     $ (127.9) $ 22.8 $ (37.3)
Minimum [Member]          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Content assets, useful life (in years)     10 years    
Maximum [Member]          
Organization And Summary Of Significant Accounting Policies [Line Items]          
Property and equipment estimated useful life     30 years