Investments in and Advances to Unconsolidated Affiliates - Affiliate Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets
Current assets	$ 416.0	$ 400.8
Other assets, net	19.3	19.3
Total assets	7,066.8	6,955.5
LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities	837.2	755.8
Other liabilities	138.9	137.8
Members' deficit	827.8	894.5
Total liabilities and shareholders' equity	7,066.8	6,955.5
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Assets
Current assets	99.2	104.8
Property and equipment, net	336.4	339.4
Other assets, net	270.1	266.1
Total assets	705.7	710.3
LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities	116.4	106.2
Long-term debt	845.6	847.2
Other liabilities	0.8	0.7
Members' deficit	(257.1)	(243.8)
Total liabilities and shareholders' equity	$ 705.7	$ 710.3