Retirement Plans (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Retirement Plans
Defined Contribution Plan, Cost	$ 209.0	$ 312.4	$ 466.9
Profit sharing component	$ 165.2	$ 264.6	$ 421.6
Percentage of employer's profit sharing contribution	8.00%	8.00%	8.00%
Employer's contribution to profit sharing plans for eligible employees	$ 132.2	$ 211.6	$ 337.2