Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Contingencies (Details)

v3.19.1
Commitments and Contingencies - Contingencies (Details)
$ / shares in Units, $ in Millions
1 Months Ended 12 Months Ended
Oct. 04, 2018
USD ($)
Mar. 31, 2017
USD ($)
$ / shares
shares
Mar. 17, 2017
lawsuit
officer
Aug. 31, 2016
USD ($)
shares
Aug. 31, 2014
USD ($)
Dec. 31, 2016
shares
Dec. 31, 2018
$ / shares
Aug. 31, 2018
$ / shares
UMG Recordings | Settled Litigation                
Loss Contingencies [Line Items]                
Payments for legal settlements | $   $ 5.0   $ 18.0        
Issuance of common stock for legal settlements (in shares)       1,800,000        
SwiftAir, LLC | Pending Litigation                
Loss Contingencies [Line Items]                
Damages sought | $         $ 9.0      
Securities Class Action Lawsuit | Settled Litigation                
Loss Contingencies [Line Items]                
Number of putative securities class action lawsuits | lawsuit     3          
Payment for settlement of legal matters | $ $ 1.1              
Common Stock                
Loss Contingencies [Line Items]                
Issuance of common stock for legal settlements (in shares)           1,751,000    
Price Per Share Scenario One | Common Stock | UMG Recordings                
Loss Contingencies [Line Items]                
Shares issued in period (in shares)   500,000   500,000        
Share price (in usd per share) | $ / shares   $ 10.00         $ 10.00 $ 10.00
Price Per Share Scenario Two | Common Stock | UMG Recordings                
Loss Contingencies [Line Items]                
Shares issued in period (in shares)   400,000   400,000        
Share price (in usd per share) | $ / shares   $ 12.00         $ 12.00 $ 12.00
Former Officer | Securities Class Action Lawsuit | Settled Litigation                
Loss Contingencies [Line Items]                
Number of defendants | officer     2          
Number of lawsuits dismissed | lawsuit     2