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Segment Reporting - Interests (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) item
Interests |  |
Number of major interests | item | 2 | 2
Revenue | $ 844.1 | $ 653.2
Major Interest One |  |
Interests |  |
Revenue | $ 103.1 | $ 97.5
Percentage of revenue (as a percent) | 12.00% | 15.00%
Major Interest Two |  |
Interests |  |
Revenue | $ 100.4 | $ 70.5
Percentage of revenue (as a percent) | 12.00% | 11.00%

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