Income Taxes - Components of Income Tax Benefit (Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Current tax benefit (expense)
Federal	$ (100.0)	$ 47.0	$ (12.5)
State	(23.1)	0.2	(9.2)
Foreign	0.0	(0.4)	(0.2)
Total current	(123.1)	46.8	(21.9)
Deferred tax benefit (expense)
Federal	(11.9)	103.6	(16.7)
State	13.3	14.7	(4.4)
Foreign	3.1	0.0	0.0
Total deferred	4.5	118.3	(21.1)
Total income tax benefit (expense)	$ (118.6)	$ 165.1	$ (43.0)