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Employee Benefit Plans (Components of Net Pension (Expense) Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Retirement Benefits [Abstract]      
Service cost $ 3.4 $ 5.3 $ 5.1
Interest cost 9.2 6.6 6.0
Expected return on plan assets (10.9) (13.2) (12.5)
Recognized net actuarial loss 1.3 2.5 5.3
Curtailments and settlements 0.0 0.0 (0.2)
Net pension expense $ 3.0 $ 1.2 $ 3.7
Weighted average assumptions for pension costs:      
Discount rate 5.00% 2.50% 2.10%
Rate of compensation increase 3.40% 3.50% 3.50%
Expected return on plan assets 6.40% 6.00% 5.90%
Weighted average assumptions for benefit obligation:      
Discount rate 4.80% 5.00% 2.50%
Rate of compensation increase 3.40% 3.40% 3.50%