Quarterly report pursuant to Section 13 or 15(d)

Commitments and Contingencies - Legal Matters (Details)

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Commitments and Contingencies - Legal Matters (Details)
$ / shares in Units, $ in Millions
1 Months Ended
Feb. 23, 2017
claim
Mar. 03, 2016
patent
Aug. 14, 2014
airline
Mar. 31, 2017
USD ($)
$ / shares
shares
Aug. 31, 2016
USD ($)
$ / shares
shares
Apr. 30, 2016
USD ($)
Jun. 30, 2017
$ / shares
Dec. 31, 2016
$ / shares
UMG Recordings | Common Stock                
Loss Contingencies [Line Items]                
Stock issued during period, litigation (in shares)         1,800,000      
UMG Recordings | Common Stock | Price Per Share Scenario One                
Loss Contingencies [Line Items]                
Stock issued during period, litigation (in shares)       500,000 500,000.0      
Share price of common stock (in usd per share) | $ / shares       $ 10.00 $ 10   $ 10.00 $ 10.00
UMG Recordings | Common Stock | Price Per Share Scenario Two                
Loss Contingencies [Line Items]                
Stock issued during period, litigation (in shares)       400,000 400,000.0      
Share price of common stock (in usd per share) | $ / shares       $ 12.00 $ 12   $ 12.00 $ 12.00
UMG Recordings | Settled litigation                
Loss Contingencies [Line Items]                
Paid to American in settlement of lawsuit | $       $ 5.0 $ 18.0      
Stock issued for legal settlements         1,800,000      
SwiftAir, LLC | Pending Litigation                
Loss Contingencies [Line Items]                
Number of plaintiffs | airline     1          
Damages sought     9.0          
Advanced Media Networks, LLC | Pending Litigation                
Loss Contingencies [Line Items]                
Patents allegedly infringed | patent   2            
STM Sellers | Pending Litigation                
Loss Contingencies [Line Items]                
Damages sought by STM Sellers | $           $ 20.0    
Putative Securities Class Action Lawsuits | Pending Litigation                
Loss Contingencies [Line Items]                
New claims filed | claim 3              
Claims dismissed | claim 2