Investments in and Advances to Unconsolidated Affiliates - Affiliate Balance Sheet (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Assets
Current assets	$ 370.6	$ 344.5
Other assets, net	19.0	27.0
Total assets	6,750.5	6,206.8
LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities	669.9	621.6
Other liabilities	141.5	122.4
Members' deficit	889.6	552.4
Total liabilities and shareholders' equity	6,750.5	6,206.8
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Assets
Current assets	127.7	91.0
Property and equipment, net	340.3	345.7
Other assets, net	268.8	265.0
Total assets	736.8	701.7
LIABILITIES AND SHAREHOLDERS' EQUITY
Current liabilities	120.9	97.9
Long-term debt	846.8	838.6
Other liabilities	0.3	0.2
Members' deficit	(231.2)	(235.0)
Total liabilities and shareholders' equity	$ 736.8	$ 701.7