Investment in and Advances to Unconsolidated Affiliates - Affiliate Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Investments in and Advances to Affiliates, Affiliate Balance Sheet [Abstract]
Current assets	$ 126.6	$ 64.0
Property and equipment, net	273.1	256.1
Other assets, net	246.0	240.1
Total assets	645.7	560.2
Current liabilities	112.7	73.3
Long-term debt	775.6	745.0
Other liabilities	41.8	20.6
Members' deficit	(284.4)	(278.7)
Total liabilities and members' deficit	$ 645.7	$ 560.2