Basis of Presentation (Narrative) (Details) $ in Millions |
3 Months Ended | 9 Months Ended | |
|---|---|---|---|
Mar. 09, 2018 |
Sep. 30, 2018
USD ($)
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Sep. 30, 2018
USD ($)
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| Liberty Media | Affiliated Entity | |||
| Class of Stock [Line Items] | |||
| Reimbursable expenses | $ 2.1 | $ 6.0 | |
| Liberty Ventures | |||
| Class of Stock [Line Items] | |||
| Shares redemption ratio | 1 | ||
| 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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