Segment Reporting (Performance Measures) (Schedule) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Segment Reporting Information [Line Items]
Revenue	$ 1,945.1	$ 1,868.4
Adjusted EBITDA	581.4	624.5
VMO2 JV
Segment Reporting Information [Line Items]
Revenue	3,282.8	3,162.7
VMO2 JV | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Segment Reporting Information [Line Items]
Adjusted EBITDA	1,073.6	1,025.9
VodafoneZiggo JV
Segment Reporting Information [Line Items]
Revenue	1,114.0	1,083.4
VodafoneZiggo JV | Equity Method Investment, Nonconsolidated Investee or Group of Investees
Segment Reporting Information [Line Items]
Adjusted EBITDA	519.0	471.5
Operating Segments | Sunrise
Segment Reporting Information [Line Items]
Revenue	854.0	807.4
Adjusted EBITDA	279.3	263.0
Operating Segments | Telenet
Segment Reporting Information [Line Items]
Revenue	762.6	754.5
Adjusted EBITDA	308.4	302.9
Operating Segments | VM Ireland
Segment Reporting Information [Line Items]
Revenue	123.0	123.0
Adjusted EBITDA	40.0	41.5
Central and Other
Segment Reporting Information [Line Items]
Revenue	269.6	244.5
Adjusted EBITDA	(31.0)	32.1
Intersegment eliminations
Segment Reporting Information [Line Items]
Revenue	(64.1)	(61.0)
Adjusted EBITDA	$ (15.3)	$ (15.0)