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Basis of Presentation (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) product | Jun. 30, 2018 USD ($)
Liberty |  |  |  |
Reimbursable amount | $ | $ 17.0 | $ 0.9 | $ 17.9 | $ 1.8
Skyhook |  |  |  |
Number of primary products | product |  |  | 2 |
Charter |  |  |  |
Investment control percentage |  |  | 25.01% |

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