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Accounting policies - Goodwill and intangible assets (Details) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2023 USD ($) | Jun. 30, 2021 USD ($) | Dec. 31, 2022 | Dec. 31, 2020 customer | Jan. 04, 2023 | Dec. 31, 2019
Aerex | Customer one | Revenue | Customer concentration risk |  |  |  |  |  |
Percentage of total |  |  |  | 80.00% |  |
Number of customers | customer |  |  |  | 1 |  |
Aerex | Customer one | Gross profit | Customer concentration risk |  |  |  |  |  |
Percentage of total |  |  |  | 89.00% |  |
PERC Water Corporation |  |  |  |  |  |
Amount of consideration paid | $ 7.8 |  |  |  |  |
Aerex | Manufacturing units |  |  |  |  |  |
Estimated fair value carrying amount exceeded percentage |  |  | 63 | 31 |  |
Estimated fair value carrying amount exceeded value |  | $ 2.9 |  |  |  |
Aerex | Discounted cash flow method | Manufacturing units |  |  |  |  |  |
Weighted Percentage Assigned to Impairment Testing, Goodwill |  | 80.00% | 80.00% | 80.00% |  |
Aerex | Guideline public company method | Manufacturing units |  |  |  |  |  |
Weighted Percentage Assigned to Impairment Testing, Goodwill |  | 20.00% | 20.00% | 20.00% |  |
PERC Water Corporation |  |  |  |  |  |
Ownership interest acquired | 39.00% |  |  | 61.00% | 39.00% | 61.00%
Amount of consideration paid | $ 2.4 |  |  |  |  |
Estimated fair value percentage segment reporting information |  |  | 79.00% |  |  |

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