Long-lived Assets (Schedule of PP&E) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 14,539.6	$ 15,062.5
Accumulated depreciation	(8,035.1)	(8,081.0)
Total property and equipment, net	6,504.5	6,981.5
Distribution systems
Property, Plant and Equipment [Line Items]
Property and equipment gross	9,134.3	9,472.8
Support equipment, buildings and land
Property, Plant and Equipment [Line Items]
Property and equipment gross	4,067.2	4,310.5
Customer premises equipment
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 1,338.1	$ 1,279.2
Minimum | Distribution systems
Property, Plant and Equipment [Line Items]
Estimated useful life at December 31, 2022	3 years
Minimum | Support equipment, buildings and land
Property, Plant and Equipment [Line Items]
Estimated useful life at December 31, 2022	3 years
Minimum | Customer premises equipment
Property, Plant and Equipment [Line Items]
Estimated useful life at December 31, 2022	4 years
Maximum | Distribution systems
Property, Plant and Equipment [Line Items]
Estimated useful life at December 31, 2022	30 years
Maximum | Support equipment, buildings and land
Property, Plant and Equipment [Line Items]
Estimated useful life at December 31, 2022	33 years
Maximum | Customer premises equipment
Property, Plant and Equipment [Line Items]
Estimated useful life at December 31, 2022	7 years