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Segment Reporting (Performance Measures) (Schedule) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Revenue	$ 2,868.0	$ 3,063.5
Adjusted OIBDA	1,183.3	1,261.7
VodafoneZiggo JV
Segment Reporting Information [Line Items]
Revenue	1,093.9	1,196.6
Adjusted OIBDA	493.8	516.9
Operating Segments
Segment Reporting Information [Line Items]
Adjusted OIBDA	1,183.3	1,261.7
Operating Segments | U.K./Ireland
Segment Reporting Information [Line Items]
Revenue	1,661.3	1,778.2
Adjusted OIBDA	708.3	762.6
Operating Segments | Belgium
Segment Reporting Information [Line Items]
Revenue	711.9	759.6
Adjusted OIBDA	339.0	357.6
Operating Segments | Switzerland
Segment Reporting Information [Line Items]
Revenue	316.0	344.9
Adjusted OIBDA	163.1	186.5
Operating Segments | Central and Eastern Europe
Segment Reporting Information [Line Items]
Revenue	119.1	129.5
Adjusted OIBDA	57.2	62.3
Operating Segments | Central and Corporate
Segment Reporting Information [Line Items]
Revenue	60.7	52.7
Adjusted OIBDA	(85.7)	(107.1)
Intersegment eliminations
Segment Reporting Information [Line Items]
Revenue	(1.0)	(1.4)
Adjusted OIBDA	$ 1.4	$ (0.2)

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