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Assets - Other Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Kateeva |  |
Other Investment |  |
Carrying value of investment | $ 21.0 | $ 21.0
Separate non-marketable investment |  |
Other Investment |  |
Amount of investment made | $ 3.5 | $ 3.5
Separate non-marketable investment | Maximum |  |
Other Investment |  |
Percentage ownership of cost method investee | 20.00% |

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