Investment in and Advances to Unconsolidated Affiliates - Affiliate Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Investments in and Advances to Affiliates, Affiliate Balance Sheet [Abstract]
Current assets	$ 58.1	$ 24.0
Property and equipment, net	243.7	95.7
Other assets, net	235.7	106.7
Total assets	537.5	226.4
Current liabilities	89.0	21.2
Long-term debt	735.3	0.0
Other liabilities	20.3	0.0
Members' (deficit) equity	(307.1)	205.2
Total liabilities and members' (deficit) equity	$ 537.5	$ 226.4