Income Taxes (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Income Taxes
Effective income tax rate reconciliation (in percent)	20.50%	27.50%
U.S. federal statutory income tax rate (as a percent)	21.00%	21.00%
Unrecognized tax benefit related to 2018 capital losses			$ 9.8
Capital gains from sale of Carson, CA property	$ 40.1
Decrease to effective tax rate due to release of a portion of the valuation allowance	4.70%
Minimum period of statute of limitations of state and foreign jurisdictions	3 years
Maximum period of statute of limitations of state and foreign jurisdictions	5 years
Deferred FICA tax payments reserve	$ 21.7