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Segment Reporting - Interests (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) item | Dec. 31, 2017 USD ($) item
Interests |  |
Number of major interests | item | 2 | 2
Revenue | $ 653.2 | $ 675.0
Major Interest One |  |
Interests |  |
Revenue | $ 97.5 | $ 90.2
Percentage of revenue (as a percent) | 14.90% | 13.40%
Major Interest Two |  |
Interests |  |
Revenue | $ 70.5 | $ 105.2
Percentage of revenue (as a percent) | 10.80% | 15.60%

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