Investments in and Advances to Unconsolidated Affiliates - Affiliate Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Assets
Current assets	$ 387.4	$ 400.8
Other assets, net	17.5	19.3
Total assets	7,172.5	6,955.5
Liabilities and Members' Deficit
Current liabilities	710.1	755.8
Other liabilities	139.0	137.8
Members' deficit	1,096.3	894.5
Total liabilities and shareholders' equity	7,172.5	6,955.5
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Assets
Current assets	93.9	104.8
Property and equipment, net	330.7	339.4
Other assets, net	270.1	266.1
Total assets	694.7	710.3
Liabilities and Members' Deficit
Current liabilities	105.6	106.2
Long-term debt	844.4	847.2
Other liabilities	0.6	0.7
Members' deficit	(255.9)	(243.8)
Total liabilities and shareholders' equity	$ 694.7	$ 710.3