Investment in and Advances to Unconsolidated Affiliates - Affiliate Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Investments in and Advances to Affiliates, Affiliate Balance Sheet [Abstract]
Current assets	$ 59.2	$ 24.0
Property and equipment, net	244.0	95.7
Other assets, net	236.2	106.7
Total assets	539.4	226.4
Current liabilities	75.1	21.2
Long-term debt	740.5	0.0
Other liabilities	25.5	0.0
Members' (deficit) equity	(301.7)	205.2
Total liabilities and members' (deficit) equity	$ 539.4	$ 226.4