Segment Reporting (Schedule Of Intersegment Expenses) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Programming and other direct costs of services	$ 403.4	$ 394.5
Operating expenses	1,110.5	1,103.6
VMO2 JV
Segment Reporting Information [Line Items]
Programming and other direct costs of services	991.5	1,107.1
Operating expenses	1,061.4	1,102.1
VodafoneZiggo JV
Segment Reporting Information [Line Items]
Programming and other direct costs of services	219.3	215.0
Operating expenses	369.6	380.0
Telenet
Segment Reporting Information [Line Items]
Programming and other direct costs of services	202.1	198.6
Operating expenses	256.0	255.6
VM Ireland
Segment Reporting Information [Line Items]
Programming and other direct costs of services	34.1	37.4
Operating expenses	$ 44.5	$ 45.6