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Accounts payable and accrued liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Accounts payable and accrued liabilities    
Accounts payable $ 3.5 $ 6.8
Accrued liabilities 37.3 35.0
Accounts payable and accrued liabilities $ 40.8 $ 41.8