Segment Reporting (Capital Expenditures of Reportable Segments) (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024
Segment Reporting Information [Line Items]
Total consolidated property and equipment additions	$ 610.8	$ 461.4
Assets acquired under capital-related vendor financing arrangements	(32.1)	(41.6)
Assets acquired under finance leases	0.0	(0.6)
Changes in current liabilities related to capital expenditures	(16.1)	(28.1)
Total capital expenditures, net	562.6	391.1
VMO2 JV And VodafoneZiggo JV
Segment Reporting Information [Line Items]
Total consolidated property and equipment additions	1,702.2	1,771.4
Operating Segments \| Reportable Segment
Segment Reporting Information [Line Items]
Total consolidated property and equipment additions	2,316.5	2,237.3
Operating Segments \| Telenet
Segment Reporting Information [Line Items]
Total consolidated property and equipment additions	516.0	384.9
Operating Segments \| VM Ireland
Segment Reporting Information [Line Items]
Total consolidated property and equipment additions	98.3	81.0
Operating Segments \| VMO2 JV
Segment Reporting Information [Line Items]
Total consolidated property and equipment additions	1,267.1	1,271.8
Operating Segments \| VodafoneZiggo JV
Segment Reporting Information [Line Items]
Total consolidated property and equipment additions	435.1	499.6
Central and Other
Segment Reporting Information [Line Items]
Total consolidated property and equipment additions	16.5	14.4
Intersegment
Segment Reporting Information [Line Items]
Total consolidated property and equipment additions	$ (20.0)	$ (18.9)

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