Basis of Presentation (Details) $ in Millions |
12 Months Ended | |
|---|---|---|
Mar. 09, 2018 |
Dec. 31, 2018
USD ($)
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| Affiliated Entity | Liberty Media | ||
| Class of Stock [Line Items] | ||
| Reimbursable expenses | $ 8.3 | |
| Liberty Ventures | Series A common stock | ||
| Class of Stock [Line Items] | ||
| Shares redemption ratio | 1 | |
| Liberty Ventures | Series B common stock | ||
| Class of Stock [Line Items] | ||
| Shares redemption ratio | 1 |
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