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Employee Benefit Plans (Summary of the change in projected benefit obligation) (Details) - Pension Plans [Member] - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Balance at January 1 $ 316.4 $ 386.0  
Service cost 21.1 25.7 $ 27.8
Interest cost 18.5 12.0 10.7
Actuarial (gain) loss 18.3 (86.7)  
Defined Benefit Plan, Benefit Obligation, Benefits Paid (22.8) (20.6)  
Balance at December 31 351.5 316.4 386.0
Employer contributions $ 3.0 $ 0.0 $ 0.0