v3.10.0.1

Segment Reporting (Performance Measures) (Schedule) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenue	$ 2,949.1	$ 2,929.7	$ 3,015.6	$ 3,063.5	$ 2,987.8	$ 2,899.3	$ 2,746.8	$ 2,642.5	$ 11,957.9	$ 11,276.4	$ 13,731.1
Adjusted OIBDA									5,151.5	4,825.1	6,080.4
VodafoneZiggo JV
Segment Reporting Information [Line Items]
Revenue											0.0
Revenue									4,602.2	4,512.5	0.0
Adjusted OIBDA									2,009.7	1,910.6	0.0
Operating Segments
Segment Reporting Information [Line Items]
Revenue									11,957.9	11,276.4	13,731.1
Operating Segments | U.K./Ireland
Segment Reporting Information [Line Items]
Revenue									6,875.1	6,398.7	6,508.8
Adjusted OIBDA									3,057.2	2,884.0	2,921.7
Operating Segments | Belgium
Segment Reporting Information [Line Items]
Revenue									2,993.6	2,865.3	2,691.1
Adjusted OIBDA									1,480.0	1,300.3	1,173.6
Operating Segments | Switzerland
Segment Reporting Information [Line Items]
Revenue									1,326.0	1,370.1	1,377.4
Adjusted OIBDA									748.7	832.6	862.8
Operating Segments | Central and Eastern Europe
Segment Reporting Information [Line Items]
Revenue									492.2	467.5	441.3
Adjusted OIBDA									249.1	233.5	227.4
Operating Segments | The Netherlands
Segment Reporting Information [Line Items]
Revenue									0.0	0.0	2,690.8
Adjusted OIBDA									0.0	0.0	1,472.7
Operating Segments | Central and Corporate
Segment Reporting Information [Line Items]
Revenue									274.2	189.4	84.1
Adjusted OIBDA									(371.7)	(415.8)	(573.6)
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Revenue									(3.2)	(14.6)	(62.4)
Adjusted OIBDA									$ (11.8)	$ (9.5)	$ (4.2)

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