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Accounts receivable - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Trade and other current receivables [abstract]        
Fair value pricing adjustments $ 0.0 $ (2.1) $ (6.0) $ (2.4)
Allowance account for credit loss $ 0.0 $ 0.0 $ (0.9) $ 0.0