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Interim Period Reporting (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Interim Period Reporting [Abstract] |  |  |  |  |
Incurred net losses | $ 1.7 | $ 3.2 | $ 1.6 | $ 2.6 |
Retained earnings | $ 199.4 |  | 199.4 |  | $ 196.2
Operating activities |  |  | $ 3.4 | $ 1.9 |

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