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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%