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Pension And Other Postretirement Benefits (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Sep. 30, 2021
Jun. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Pension Plan              
Defined Benefit Plan Disclosure [Line Items]              
Employer contributions         $ 2.1    
Defined Benefit Plan, Pension Asset, (Increase)Decrease For Remeasurement Due To Settlement   $ 39.8          
Change in Regulatory Assets Due to Interim Measurement   30.0   $ 30.0      
Change in Accumulated Other Comprehensive Income Due to Interim Measurement   3.5   3.5      
Change to Defined Benefit Plan Net Periodic Costs Due to Interim Measurement   $ 5.7   $ 5.7      
Discount rate   4.13%   4.13%     2.60%
Discount rate- service cost       4.30%     2.85%
Discount rate - interest cost       3.64%     1.90%
Expected return on assets       5.70%     4.80%
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement $ 3.0 $ 6.3 $ 2.9   9.3 $ 9.5  
Other Postretirement Benefit Plan              
Defined Benefit Plan Disclosure [Line Items]              
Employer contributions         15.9    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement $ 0.0   $ 0.0   $ 0.0 $ 0.0