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Pension and Other Postretirement Benefits (Schedule Of Pension Plan And Postretirement Plan Asset Mix) (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 1,663.6 $ 1,647.7  
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of total asset 100.00% 100.00%  
Pension Plan | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 1,426.8 $ 1,422.8 $ 1,981.7
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Percentage of total asset 100.00% 100.00%  
Other Postretirement Benefits | Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 236.5 $ 224.9 $ 293.7
Domestic Equities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 261.7 $ 231.1  
Percentage of total asset 18.30% 16.20%  
Domestic Equities | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 93.7 $ 86.9  
Percentage of total asset 39.60% 38.60%  
International Equities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 141.9 $ 119.0  
Percentage of total asset 9.90% 8.40%  
International Equities | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 40.7 $ 36.6  
Percentage of total asset 17.20% 16.30%  
Fixed Income | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 939.9 $ 1,004.3  
Percentage of total asset 65.90% 70.60%  
Fixed Income | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 97.0 $ 94.7  
Percentage of total asset 41.00% 42.10%  
Real Estate | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 4.0 $ 5.0  
Percentage of total asset 0.30% 0.30%  
Real Estate | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 0.0 $ 0.0  
Percentage of total asset 0.00% 0.00%  
Cash/Other [Member] | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 79.3 $ 63.4  
Percentage of total asset 5.60% 4.50%  
Cash/Other [Member] | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 5.1 $ 6.7  
Percentage of total asset 2.20% 3.00%  
Commingled Funds | Short-Term Money Markets | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 65.3 $ 46.2  
Commingled Funds | Short-Term Money Markets | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 5.2 17.4  
Commingled Funds | International Equities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 102.3 89.6  
Commingled Funds | International Equities | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 22.8 20.3  
Commingled Funds | Fixed Income | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 242.2 275.9  
Commingled Funds | United States Equities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 148.5 133.7  
Commingled Funds | United States Equities | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 11.4 $ 10.7