Retirement Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Defined Contribution Plan, Other Than Employee Stock Ownership Plan, Contributions	$ 40,400,000	$ 33,000,000	$ 26,700,000
Employee Supplemental Savings Plan (ESSP) Percentage of Annual Base Compensation		75.00%
Employee Supplemental Savings Plan (ESSP) Percentage of Bonus		100.00%
Employee Supplemental Savings Plan (ESSP), Employee Contribution	$ 0	$ 500,000	$ 3,400,000
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	100.00%	100.00%
Defined Benefit Plan, Benefit Obligation	$ 600,000	$ 700,000