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Employee Benefit Plans (Components of Net Pension Expense) (Details) - Pension Plans [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Components of Net Pension Expense:      
Service cost $ 21.1 $ 25.7 $ 27.8
Interest cost 18.5 12.0 10.7
Expected return on plan assets (21.6) (22.3) (21.7)
Recognized net actuarial loss 0.3 1.4 4.5
Net Pension Expense $ 18.3 $ 16.8 $ 21.3
Assumptions Used to Determine End-of-Year Benefit Obligation:      
Discount rate 5.20% 5.60% 3.00%
Rate of compensation increase 4.00% 4.00% 4.00%
Cash balance interest crediting rate 5.14% 4.75% 4.00%
Assumptions Used to Determine Net Pension Expense:      
Discount rate 5.60% 3.00% 2.70%
Rate of compensation increase 4.00% 4.00% 4.00%
Expected return on plan assets 6.75% 5.75% 5.75%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Cash Balance Interest Crediting Rate 4.75% 4.00% 4.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate 4.00%