Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Plans
Defined Contribution Plan, Cost Recognized	$ 382.8	$ 74.5	$ 98.8
Profit sharing component	$ 359.8	$ 58.3	$ 73.6
Percentage of employer's profit sharing contribution	8.00%	8.00%	8.00%
Employer's contribution to profit sharing plans for eligible employees	$ 287.8	$ 46.7	$ 58.9