Income Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Amount of pretax income
Federal statutory rate	$ (36.8)	$ (113.2)	$ 175.2
State and local income taxes, net of federal benefits	(5.2)	(7.7)	12.1
Tax law change	(10.8)	0.0	0.0
Nondeductible expenses	(7.8)	(13.3)	(2.6)
Goodwill impairment losses	0.0	0.0	(19.0)
Compensation	(6.2)	6.5	20.5
Foreign	0.9	0.9	(0.4)
Valuation allowance	113.4	(5.9)	(32.7)
Tax credits	4.6	5.8	10.0
Equity investment write-off	0.0	11.3	0.0
Other	(5.7)	(3.0)	2.0
Total income tax benefit (expense)	$ 46.4	$ (118.6)	$ 165.1
Effective Tax Rate	(26.50%)	22.00%	19.80%