Investment In and Advances to Unconsolidated Affiliates - Balance Sheet of Equity Method Investments (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Assets
Current assets	$ 24.0	$ 64.5
Property and equipment, net	95.7	234.6
Other assets, net	106.7	236.5
Total assets	226.4	535.6
Liabilities and Members' Equity
Current liabilities	21.2	100.3
Long-term debt	0.0	110.1
Other liabilities	0.0	0.1
Members' equity	205.2	325.1
Total liabilities and members' equity	$ 226.4	$ 535.6