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Segment Reporting (Performance Measures) (Schedule) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenue	$ 2,982.2	$ 2,840.9	$ 2,850.4	$ 2,868.0	$ 2,949.1	$ 2,929.7	$ 3,015.6	$ 3,063.5	$ 11,541.5	$ 11,957.9	$ 11,276.4
Adjusted OIBDA									4,859.5	5,151.5	4,825.1
VodafoneZiggo JV
Segment Reporting Information [Line Items]
Revenue									4,407.8	4,602.2	4,512.5
Adjusted OIBDA									1,987.7	2,009.7	1,910.6
Operating Segments | U.K./Ireland
Segment Reporting Information [Line Items]
Revenue									6,600.3	6,875.1	6,398.7
Adjusted OIBDA									2,800.5	2,995.5	2,831.2
Operating Segments | Belgium
Segment Reporting Information [Line Items]
Revenue									2,893.0	2,993.6	2,865.3
Adjusted OIBDA									1,386.1	1,480.0	1,300.3
Operating Segments | Switzerland
Segment Reporting Information [Line Items]
Revenue									1,258.8	1,326.0	1,370.1
Adjusted OIBDA									627.9	712.0	800.3
Operating Segments | Central and Eastern Europe
Segment Reporting Information [Line Items]
Revenue									475.4	492.2	467.5
Adjusted OIBDA									215.0	233.6	220.1
Central and Corporate
Segment Reporting Information [Line Items]
Revenue									316.4	274.2	189.4
Adjusted OIBDA									(171.1)	(257.8)	(317.3)
Intersegment eliminations
Segment Reporting Information [Line Items]
Revenue									(2.4)	(3.2)	(14.6)
Adjusted OIBDA									$ 1.1	$ (11.8)	$ (9.5)

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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