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Assets - Other Assets (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Kateeva |  |
Other Investment Not Readily Marketable [Line Items] |  |
Carrying amount | $ 21.0 | $ 21.0
Kateeva | Maximum |  |
Other Investment Not Readily Marketable [Line Items] |  |
Percentage ownership of cost method investee | 20.00% |
Separate non-marketable investment |  |
Other Investment Not Readily Marketable [Line Items] |  |
Amount of investment made | $ 3.5 |
Separate non-marketable investment | Maximum |  |
Other Investment Not Readily Marketable [Line Items] |  |
Percentage ownership of cost method investee | 20.00% |

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