Income Taxes - Reconciliation of Effective Income Tax Rate (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Percent and amount of pretax income
Federal statutory rate	21.00%	21.00%	21.00%
State and local income taxes, net of federal benefits	1.40%	1.40%	9.90%
Nondeductible expenses	2.50%	(0.30%)	4.00%
Goodwill impairment losses	0.00%	(2.30%)	14.40%
Compensation	(1.20%)	2.50%	0.30%
Foreign	(0.20%)	0.00%	0.10%
Federal valuation allowance	1.10%	(3.90%)	0.00%
Tax credits	(1.10%)	1.20%	0.00%
Equity investment write-off	(2.10%)	0.00%	0.00%
Other	0.60%	0.20%	0.20%
Total effective tax rate and income tax benefit (expense)	22.00%	19.80%	49.90%
Amount of pretax income
Federal statutory rate	$ (113.2)	$ 175.2	$ (18.1)
State and local income taxes, net of federal benefits	(7.7)	12.1	(8.5)
Nondeductible expenses	(13.3)	(2.6)	(3.5)
Goodwill impairment losses	0.0	(19.0)	(12.4)
Compensation	6.5	20.5	(0.3)
Foreign	0.9	(0.4)	(0.1)
Federal valuation allowance	(5.9)	(32.7)	0.0
Tax credits	5.8	10.0	0.0
Equity investment write-off	11.3	0.0	0.0
Other	(3.0)	2.0	(0.1)
Total income tax benefit (expense)	$ (118.6)	$ 165.1	$ (43.0)