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Long-lived Assets (Schedule of PP&E) (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Property, Plant and Equipment [Line Items]    
Property and equipment gross $ 15,686.5 $ 16,108.7
Accumulated depreciation (8,638.2) (8,748.5)
Total property and equipment, net 7,048.3 7,360.2
Distribution systems    
Property, Plant and Equipment [Line Items]    
Property and equipment gross 10,350.9 10,638.0
Support equipment, buildings and land    
Property, Plant and Equipment [Line Items]    
Property and equipment gross 3,996.1 4,116.0
Customer premises equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment gross $ 1,339.5 $ 1,354.7