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Retirement Plans And Postretirement Benefits (Retirement Plan Weighted Average Asset Allocations) (Details)
Dec. 31, 2017
Fixed Income Securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Weighted average asset allocations 100.00%
U.S.  
Defined Benefit Plan Disclosure [Line Items]  
Weighted average target asset allocations 100.00%
U.S. | Equity Securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Weighted average asset allocations 20.00%
Weighted average target asset allocations 20.00%
U.S. | Fixed Income Securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Weighted average asset allocations 80.00%
Weighted average target asset allocations 80.00%
Foreign  
Defined Benefit Plan Disclosure [Line Items]  
Weighted average target asset allocations 100.00%
Foreign | Fixed Income Securities [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Weighted average target asset allocations 100.00%