Segment Reporting (Performance Measures) (Schedule) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Revenue	$ 7,491.4	$ 7,195.7	$ 10,311.3
Adjusted EBITDA	2,369.6	2,595.4	3,963.1
VMO2 JV
Segment Reporting Information [Line Items]
Revenue	13,574.1	12,857.2	8,522.9
Adjusted EBITDA	4,531.3	4,562.2	2,716.6
VodafoneZiggo JV
Segment Reporting Information [Line Items]
Revenue	4,450.5	4,284.6	4,824.2
Adjusted EBITDA	1,972.5	2,018.0	2,265.6
Operating Segments | Sunrise
Segment Reporting Information [Line Items]
Revenue	3,380.4	3,180.9	3,321.9
Adjusted EBITDA	1,148.5	1,097.8	1,164.4
Operating Segments | Telenet
Segment Reporting Information [Line Items]
Revenue	3,089.2	2,807.3	3,065.9
Adjusted EBITDA	1,315.2	1,299.6	1,472.2
Operating Segments | VM Ireland
Segment Reporting Information [Line Items]
Revenue	506.1	494.7	550.0
Adjusted EBITDA	181.4	183.6	202.6
Operating Segments | Virgin Media U.K.
Segment Reporting Information [Line Items]
Revenue	0.0	0.0	2,736.4
Adjusted EBITDA	0.0	0.0	1,085.3
Central and Other
Segment Reporting Information [Line Items]
Revenue	775.7	959.9	915.4
Adjusted EBITDA	(214.7)	74.7	103.3
Intersegment eliminations
Segment Reporting Information [Line Items]
Revenue	(260.0)	(247.1)	(278.3)
Adjusted EBITDA	$ (60.8)	$ (60.3)	$ (64.7)