Segment Reporting (Capital Expenditures of Reportable Segments) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Total property and equipment additions	$ 365.1	$ 389.9
Assets acquired under capital-related vendor financing arrangements	(39.8)	(42.3)
Assets acquired under finance leases	(0.5)	(7.3)
Changes in current liabilities related to capital expenditures	26.0	36.9
Total capital expenditures, net	350.8	377.2
VMO2 JV
Segment Reporting Information [Line Items]
Property and equipment additions:	685.8	590.6
VodafoneZiggo JV
Segment Reporting Information [Line Items]
Property and equipment additions:	244.7	250.4
Operating Segments \| Sunrise
Segment Reporting Information [Line Items]
Total property and equipment additions	149.9	149.0
Operating Segments \| Telenet
Segment Reporting Information [Line Items]
Total property and equipment additions	183.7	173.0
Operating Segments \| VM Ireland
Segment Reporting Information [Line Items]
Total property and equipment additions	39.4	33.1
Central and Other
Segment Reporting Information [Line Items]
Total property and equipment additions	7.4	49.8
Intersegment eliminations
Segment Reporting Information [Line Items]
Total property and equipment additions	$ (15.3)	$ (15.0)

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