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Assets - Other Assets (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Other assets |  |
Carrying value | $ 21.0 | $ 21.0
Additional investment | $ 3.5 |
Maximum |  |
Other assets |  |
Percentage ownership of cost method investee | 20.00% |

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