Accrued Expenses (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016
Accrued Expenses
Accrued payables	$ 4.6	$ 1.2
Accrued payroll	3.8	0.1
Accrued taxes	1.6	0.7
Accrued insurance	3.5
Total accrued expenses	$ 13.5	$ 2.0