Income Taxes - Components of Income Tax Benefit (Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Current tax expense
Federal	$ (20.8)	$ (89.0)	$ (100.0)
State	(4.9)	(15.3)	(23.1)
Total current	(25.7)	(104.3)	(123.1)
Deferred tax benefit (expense)
Federal	13.2	33.7	(11.9)
State	22.8	78.5	13.3
Foreign	(2.1)	38.5	3.1
Total deferred	33.9	150.7	4.5
Total income tax benefit (expense)	$ 8.2	$ 46.4	$ (118.6)