Investments in and Advances to Unconsolidated Affiliates - Affiliate Balance Sheet (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Assets
Current assets	$ 436.0	$ 400.8
Other assets, net	18.3	19.3
Total assets	7,170.1	6,955.5
LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities	763.2	755.8
Other liabilities	140.6	137.8
Members' deficit	1,031.9	894.5
Total liabilities and shareholders' equity	7,170.1	6,955.5
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Assets
Current assets	91.9	104.8
Property and equipment, net	334.3	339.4
Other assets, net	270.1	266.1
Total assets	696.3	710.3
LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities	103.7	106.2
Long-term debt	847.0	847.2
Other liabilities	0.8	0.7
Members' deficit	(255.2)	(243.8)
Total liabilities and shareholders' equity	$ 696.3	$ 710.3