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Summary of Significant Accounting Policies - Recently adopted accounting pronouncements (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Retained earnings | $ (286.7) | $ (198.3) | $ (89.8)
Cumulative Effect, Period of Adoption, Adjustment | Revision of Prior Period, Adjustment |  |  |
Retained earnings |  | $ 0.0 |

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