Investment in and Advances to Unconsolidated Affiliates - Affiliate Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Investments in and Advances to Affiliates, Affiliate Balance Sheet [Abstract]
Current assets	$ 98.3	$ 64.0
Property and equipment, net	271.2	256.1
Other assets, net	246.1	240.1
Total assets	615.6	560.2
Current liabilities	91.3	73.3
Long-term debt	790.1	745.0
Other liabilities	43.9	20.6
Members' deficit	(309.7)	(278.7)
Total liabilities and members' deficit	$ 615.6	$ 560.2