Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Narrative (Details)

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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]        
Rent expenses $ 20.6 $ 20.5 $ 12.2  
Deferred rent 23.8 $ 27.6    
Content acquisition costs 324.1      
Amortization of prepaid content acquisition costs 268.4      
Total future minimum guarantee payments 405.2      
Future minimum guarantee commitments to be paid this year $ 394.2      
Indemnification agreement        
Loss Contingencies [Line Items]        
Accrued indemnification liabilities       $ (3.9)