Income Taxes - Book Income Reconciliation To Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Expected income tax expense based on federal statutory tax rate	$ (56.5)	$ (55.9)	$ (10.0)
State income tax expense, net of federal benefit	(7.2)	(7.0)	(1.4)
Unit-based compensation	7.7	0.7	(3.1)
Statutory rate changes	0.0	0.0	(10.2)
Change in valuation allowance	1.2	(151.6)	(1.7)
Other	(5.6)	5.5	(2.4)
Income tax benefit (expense)	$ (62.8)	$ 94.9	(25.4)
Oklahoma
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Deferred state income tax expense (benefit)			7.6
Louisiana
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Deferred state income tax expense (benefit)			$ 2.6