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Pension and Other Postretirement Benefits (Schedule Of Pension Plan And Postretirement Plan Asset Mix) (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Inputs, Level 1, 2 and 3      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 2,275.4 $ 2,404.1  
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 $ 1,981.7 $ 2,117.7 $ 2,080.9
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 $ 293.7 $ 286.4 $ 261.4
Domestic Equities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 324.3 $ 446.3  
Percentage of total asset 16.40% 21.00%  
Domestic Equities | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 118.6 $ 108.8  
Percentage of total asset 40.40% 38.00%  
International Equities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 150.9 $ 230.1  
Percentage of total asset 7.60% 10.90%  
International Equities | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 50.5 $ 48.2  
Percentage of total asset 17.20% 16.80%  
Fixed Income | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 1,382.3 $ 1,291.2  
Percentage of total asset 69.70% 61.00%  
Fixed Income | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 118.8 $ 122.0  
Percentage of total asset 40.40% 42.60%  
Real Estate | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 37.2 $ 52.9  
Percentage of total asset 1.90% 2.50%  
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 $ 87.0 $ 97.2  
Percentage of total asset 4.40% 4.60%  
Cash/Other [Member] | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 5.8 $ 7.4  
Percentage of total asset 2.00% 2.60%  
Commingled Funds | Short-Term Money Markets | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 55.0 $ 78.8  
Commingled Funds | Short-Term Money Markets | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 5.8 7.6  
Commingled Funds | International Equities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 111.7 176.8  
Commingled Funds | International Equities | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 26.1 24.1  
Commingled Funds | Fixed Income | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 349.1 337.6  
Commingled Funds | United States Equities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 195.9 279.7  
Commingled Funds | United States Equities | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 14.8 $ 14.0