Other Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Other accrued liabilities
Compensation and other employee benefits	$ 34.4	$ 13.9
Construction in progress accruals	5.0	8.3
Accrued interest	2.4	13.4
Other Liabilities	28.9	28.8
Total other accrued liabilities	$ 70.7	$ 64.4