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Accounts payable and accrued liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Accounts payable and accrued liabilities    
Accounts payable $ 6.8 $ 7.3
Accrued liabilities 35.0 16.3
Accounts Payable and Accrued Liabilities $ 41.8 $ 23.6