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Commitments and contingencies - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Feb. 28, 2021 | Dec. 31, 2022
Thomson Reservoir Sediment Remediation Project [Member] |  |
Site Contingency [Line Items] |  |
Accrued amount |  | $ 5.6
Great Lakes Legacy Act [Member] |  |
Site Contingency [Line Items] |  |
Percentage of federal funding for remediation of contaminated sediments | 65.00% |
Required percentage of cash or in-kind contributions from non-federal sponsors | 35.00% |

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