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Pension and Other Postretirement Benefits (Schedule Of Pension Plan And Postretirement Plan Asset Mix) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 2,084.1 $ 2,422.5  
Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 1,867.7 $ 2,160.0 $ 1,750.9
Percentage of total asset 100.00% 100.00%  
Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 216.3 $ 262.5 $ 231.4
Percentage of total asset 100.00% 100.00%  
Domestic Equities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 355.5 $ 698.2  
Percentage of total asset 19.00% 32.30%  
Domestic Equities | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 78.8 $ 96.0  
Percentage of total asset 36.40% 36.60%  
International Equities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 165.5 $ 351.0  
Percentage of total asset 8.90% 16.20%  
International Equities | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 17.5 $ 39.8  
Percentage of total asset 8.10% 15.20%  
Fixed Income | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 1,241.9 $ 977.6  
Percentage of total asset 66.50% 45.30%  
Fixed Income | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 115.1 $ 117.5  
Percentage of total asset 53.20% 44.80%  
Real Estate | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 52.7 $ 49.9  
Percentage of total asset 2.80% 2.30%  
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 $ 52.1 $ 83.3  
Percentage of total asset 2.80% 3.90%  
Cash/Other [Member] | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 4.9 $ 9.2  
Percentage of total asset 2.30% 3.40%  
Commingled Funds | Short-Term Money Markets | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 18.3 [1] $ 34.1 [2]  
Commingled Funds | Short-Term Money Markets | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 5.2 [1] 9.4 [2]  
Commingled Funds | International Equities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 122.3 [1] 265.1 [2]  
Commingled Funds | Fixed Income | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 365.7 [1] 244.9 [2]  
Commingled Funds | United States Equities | Pension Plan      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount 245.2 [1] 466.6 [2]  
Commingled Funds | United States Equities | Other Postretirement Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Plan Assets, Amount $ 10.4 [1] $ 12.2 [2]  
[1] This class of investments is measured at fair value using the net asset value per share and has not been classified in the fair value hierarchy.
[2] This class of investments is measured at fair value using the net asset value per share and has not been classified in the fair value hierarchy.