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Income Taxes - Net Operating Losses and Income Tax Concessions (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Income taxes |  |
Net operating loss carryforward, Total | $ 45.9 | $ 57.4
2022-2041 |  |
Income taxes |  |
Net operating Loss carryforward, US | 8.4 |
Indefinite |  |
Income taxes |  |
Net operating Loss carryforward, US | 4.0 |
Net operating Loss carryforward, Foreign | 28.3 |
2022-2041 |  |
Income taxes |  |
Net operating Loss carryforward, Foreign | $ 5.1 |

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