Income Taxes - Book Income Reconciliation To Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Amount [Abstract]
Expected income tax benefit (expense) based on federal statutory tax rate	$ (55.9)	$ (10.0)	$ 58.5
State income tax benefit (expense), net of federal benefit	(7.0)	(1.4)	6.5
Unit-based compensation	0.7	(3.1)	(6.0)
Non-deductible expense related to impairments	0.0	0.0	(43.4)
Statutory rate changes	0.0	(10.2)	0.0
Change in valuation allowance	(151.6)	(1.7)	153.3
Other	5.5	(2.4)	(5.5)
Total income tax benefit (expense)	$ 94.9	(25.4)	$ (143.2)
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