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Accrued Liabilities - Third Parties - Schedule of Accrued Liabilities (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Transportation, project engineering $ 9.5 $ 3.5
Property taxes 2.1 0.6
Professional fees 0.4 0.3
Other accrued liabilities 0.7 1.2
Accrued liabilities - third parties $ 12.7 $ 5.6