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Employee Benefit Plans (Components of Net Pension Expense) (Details) - Pension Plans [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Components of Net Pension Expense:
Service cost	$ 25.7	$ 27.8	$ 26.7
Interest cost	12.0	10.7	11.7
Expected return on plan assets	(22.3)	(21.7)	(21.0)
Recognized net actuarial loss	1.4	4.5	4.8
Net Pension Expense	$ 16.8	$ 21.3	$ 22.2
Assumptions Used to Determine End-of-Year Benefit Obligation:
Discount rate	5.60%	3.00%	2.70%
Rate of compensation increase	4.00%	4.00%	4.00%
Cash balance interest crediting rate	4.75%	4.00%	4.00%
Assumptions Used to Determine Net Pension Expense:
Discount rate	3.00%	2.70%	3.40%
Rate of compensation increase	4.00%	4.00%	5.00%
Expected return on plan assets	5.75%	5.75%	6.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Cash Balance Interest Crediting Rate	4.00%	4.00%	4.00%

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