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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Accounts Payable and Accrued Liabilities    
Accounts payable $ 6.2 $ 9.6
Accrued liabilities 15.3 11.4
Accounts Payable and Accrued Liabilities $ 21.5 $ 21.0