Investment In and Advances To Unconsolidated Affiliates - Balance Sheet of Equity Method Investments (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Assets
Current assets	$ 38.8	$ 34.2
Noncurrent assets	363.0	339.5
Total assets	401.8	373.7
Liabilities and Members' Equity
Current liabilities	77.5	44.4
Noncurrent liabilities	69.3	79.7
Members' equity	255.0	249.6
Total liabilities and members' equity	$ 401.8	$ 373.7