Income Taxes - Reconciliations of Statutory U.S. Federal Income Tax Rates to Our Effective Tax Rate for Continuing Operations (Details)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory rate	21.00%	21.00%	21.00%
State tax, net of federal benefit	3.10%	2.90%	3.90%
Business tax credits	(0.80%)	(2.20%)	(3.50%)
Reverse federal impact of indemnification adjustments	0.10%	0.20%	0.30%
Unrecognized tax benefits, U.S. federal and state, net of federal benefit	0.40%	0.70%	(0.10%)
Other, net	0.90%	1.10%	0.70%
Effective tax rate	24.70%	23.70%	22.30%