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Employee Benefit Plans (Fair Value of Plan Assets) (Details) - Pension Plans [Member] - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Plan, Plan Assets, Amount $ 402.3 $ 388.2 $ 356.9 $ 315.8
Defined Benefit Plan, Cash [Member]        
Actual allocation of plan assets, Fixed income 4.90% 3.60%    
Fixed Income Funds [Member]        
Actual allocation of plan assets, Fixed income 39.30% 36.10%    
US Equity [Member]        
Actual allocation of plan assets, Fixed income 35.50% 38.50%    
Foreign equity [Member]        
Actual allocation of plan assets, Fixed income 20.30% 21.80%    
Fair Value, Inputs, level 2 [Member]        
Defined Benefit Plan, Plan Assets, Amount $ 402.3 $ 388.2    
Fair Value, Inputs, level 2 [Member] | Defined Benefit Plan, Cash [Member]        
Defined Benefit Plan, Plan Assets, Amount 19.8 14.1    
Fair Value, Inputs, level 2 [Member] | Fixed Income Funds [Member]        
Defined Benefit Plan, Plan Assets, Amount 158.2 140.2    
Fair Value, Inputs, level 2 [Member] | US Equity [Member]        
Defined Benefit Plan, Plan Assets, Amount 142.8 149.4    
Fair Value, Inputs, level 2 [Member] | Foreign equity [Member]        
Defined Benefit Plan, Plan Assets, Amount $ 81.5 $ 84.5