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Pension and Other Postretirement Benefits (Schedule Of Changes In Plan Assets And Projected Benefit Obligations Recognized In Other Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Plan      
Net prior service cost/(credit) $ 0.0 $ 0.2  
Net actuarial (gain)/loss (20.9) 158.9  
Settlements (9.2) (12.4) $ (11.4)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (0.1) (0.1) (0.1)
Less: amortization of net actuarial (gain) loss (33.7) (20.3) (21.7)
Total Recognized in Other Comprehensive Income or Regulatory Asset or Liability (63.9) 126.3  
Amount Recognized in Net Periodic Benefits Cost and Other Comprehensive Income or Regulatory Asset or Liability (26.5) 136.6  
Other Postretirement Benefits      
Net prior service cost/(credit) 3.3 2.1  
Net actuarial (gain)/loss 16.0 (21.8)  
Settlements 0.0 0.0 0.0
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 2.1 2.2 2.2
Less: amortization of net actuarial (gain) loss (3.3) (2.6) $ (4.6)
Total Recognized in Other Comprehensive Income or Regulatory Asset or Liability 18.1 (20.1)  
Amount Recognized in Net Periodic Benefits Cost and Other Comprehensive Income or Regulatory Asset or Liability $ 31.1 $ (17.4)