Commitments and contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Unrecorded Unconditional Purchase Obligation [Line Items]
Minimum volume commitment deficiency payments	$ 13.2	$ 4.4	$ 4.0
Minimum volume commitments deficiency payments liability	11.5	$ 4.7
Firm sale and transportation commitments
Unrecorded Unconditional Purchase Obligation [Line Items]
Future drilling contracts commitments	$ 165.6