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Employee Benefit Plans (Fair Value of Plan Assets) (Details) - Pension Plans [Member] - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan, Plan Assets, Amount $ 350.8 $ 331.7 $ 402.3 $ 388.2
Defined Benefit Plan, Cash [Member]        
Actual allocation of plan assets, Fixed income 1.80% 5.00%    
Fixed Income Funds [Member]        
Actual allocation of plan assets, Fixed income 47.10% 39.70%    
US Equity [Member]        
Actual allocation of plan assets, Fixed income 37.50% 39.10%    
Foreign equity [Member]        
Actual allocation of plan assets, Fixed income 13.60% 16.20%    
Fair Value, Inputs, level 2 [Member]        
Defined Benefit Plan, Plan Assets, Amount $ 350.8 $ 331.7    
Fair Value, Inputs, level 2 [Member] | Defined Benefit Plan, Cash [Member]        
Defined Benefit Plan, Plan Assets, Amount 6.2 16.6    
Fair Value, Inputs, level 2 [Member] | Fixed Income Funds [Member]        
Defined Benefit Plan, Plan Assets, Amount 165.3 131.6    
Fair Value, Inputs, level 2 [Member] | US Equity [Member]        
Defined Benefit Plan, Plan Assets, Amount 131.6 129.8    
Fair Value, Inputs, level 2 [Member] | Foreign equity [Member]        
Defined Benefit Plan, Plan Assets, Amount $ 47.7 $ 53.7