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Accounts payable and accrued liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Accounts payable and accrued liabilities    
Accounts payable $ 8.5 $ 3.5
Accrued liabilities 25.1 37.3
Accounts payable and accrued liabilities $ 33.6 $ 40.8