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Income Taxes (Summary Of The Tax Years By Jurisdiction That Remain Subject To Examination By Taxing Authorities) (Details)
12 Months Ended
Dec. 31, 2023
Minimum [Member] | United States Federal [Member]  
Tax years open 2015
Maximum [Member] | United States Federal [Member]  
Tax years open 2023
Various U.S. States [Member] | Minimum [Member]  
Tax years open 2019
Various U.S. States [Member] | Maximum [Member]  
Tax years open 2023
Canada [Member] | Minimum [Member]  
Tax years open 2006
Canada [Member] | Maximum [Member]  
Tax years open 2023