Pension And Other Postretirement Benefits (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 1.3
Defined Benefit Plan, Pension Asset, (Increase)Decrease For Remeasurement Due To Settlement	39.8
Change in Regulatory Assets Due to Interim Measurement	30.0
Change in Accumulated Other Comprehensive Income Due to Interim Measurement	3.5
Change to Defined Benefit Plan Net Periodic Costs Due to Interim Measurement	$ 5.7
Discount rate	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%
Other Postretirement Benefit Plan
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 10.5