Retirement, Postretirement And Other Benefit Plans (Weighted Average Assumptions Used To Determine Net Periodic Benefit Costs) (Details)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.73%	3.97%
Expected long-term return on plan assets	5.69%	5.68%
Post-Retirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Discount rate	3.75%	3.99%