Segment Reporting (Schedule Of Intersegment Expenses) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Programming and other direct costs of services:	$ 465.3	$ 336.4	$ 868.7	$ 730.9
Operating expenses:	1,239.5	1,090.9	2,350.0	2,194.5
VMO2 JV
Segment Reporting Information [Line Items]
Programming and other direct costs of services:	1,021.3	1,147.5	2,012.8	2,254.6
Operating expenses:	1,179.9	1,095.5	2,241.3	2,197.6
VodafoneZiggo JV
Segment Reporting Information [Line Items]
Programming and other direct costs of services:	226.4	208.4	445.7	423.4
Operating expenses:	400.2	364.5	769.8	744.5
Telenet
Segment Reporting Information [Line Items]
Programming and other direct costs of services:	187.8	183.4	389.9	382.0
Operating expenses:	275.3	259.8	531.3	515.4
VM Ireland
Segment Reporting Information [Line Items]
Programming and other direct costs of services:	32.5	27.8	66.6	65.2
Operating expenses:	$ 48.9	$ 46.5	$ 93.4	$ 92.1

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.