Commitments and Contingencies - Contingencies (Details) - USD ($) $ / shares in Units, $ in Millions  | 
1 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2017  | 
Aug. 31, 2016  | 
Aug. 31, 2014  | 
Jun. 30, 2019  | 
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| Settled litigation | UMG Recordings | ||||
| Loss Contingencies [Line Items] | ||||
| Paid to American in settlement of lawsuit | $ 5.0 | $ 18.0 | ||
| Stock issued for legal settlements (in shares) | 1,800,000 | |||
| Pending Litigation | BMG | ||||
| Loss Contingencies [Line Items] | ||||
| Loss contingency | $ 1.0 | |||
| Pending Litigation | SwiftAir, LLC | ||||
| Loss Contingencies [Line Items] | ||||
| Damages sought | $ 9.0 | |||
| Price Per Share Scenario One | Common Stock | UMG Recordings | ||||
| Loss Contingencies [Line Items] | ||||
| Stock issued during period, litigation (in shares) | 500,000 | |||
| Share price (in usd per share) | $ 10.00 | |||
| Price Per Share Scenario Two | Common Stock | UMG Recordings | ||||
| Loss Contingencies [Line Items] | ||||
| Stock issued during period, litigation (in shares) | 400,000 | |||
| Share price (in usd per share) | $ 12.00 | |||
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- Definition Stock Issued During Period, Shares, Issued For Legal Settlements No definition available. 
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available. 
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- Definition Amount of loss contingency liability. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition The value (monetary amount) of the award the plaintiff seeks in the legal matter. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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- Definition Price of a single share of a number of saleable stocks of a company. No definition available. 
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- Definition Number of new stock issued during the period. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef 
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