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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Segment Reporting (Geographic Segments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenue	$ 2,850.4	$ 3,015.6	$ 5,718.4	$ 6,079.1
VodafoneZiggo JV
Segment Reporting Information [Line Items]
Revenue	1,084.5	1,133.3	2,178.4	2,329.9
Operating Segments \| U.K.
Segment Reporting Information [Line Items]
Revenue	1,517.7	1,605.6	3,051.2	3,250.0
Operating Segments \| Belgium
Segment Reporting Information [Line Items]
Revenue	713.2	753.9	1,425.1	1,513.5
Operating Segments \| Switzerland
Segment Reporting Information [Line Items]
Revenue	315.0	332.2	631.0	677.1
Operating Segments \| Ireland
Segment Reporting Information [Line Items]
Revenue	126.3	129.3	254.1	263.1
Operating Segments \| Poland
Segment Reporting Information [Line Items]
Revenue	106.7	110.4	213.4	226.4
Operating Segments \| Slovakia
Segment Reporting Information [Line Items]
Revenue	12.4	12.9	24.8	26.4
Other, including intersegment eliminations
Segment Reporting Information [Line Items]
Revenue	$ 59.1	$ 71.3	$ 118.8	$ 122.6