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Segment Reporting - Interests (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 USD ($) item | Dec. 31, 2019 USD ($) item
Interests |  |
Number of major interests | item | 3 | 2
Revenue | $ 1,020.2 | $ 844.1
Major Interest One |  |
Interests |  |
Revenue | $ 360.7 | $ 203.5
Percentage of revenue (as a percent) | 13.00% | 12.00%
Major Interest Two |  |
Interests |  |
Percentage of revenue (as a percent) | 12.00% | 12.00%
Major Interest Three |  |
Interests |  |
Percentage of revenue (as a percent) | 10.00% |

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