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Segment Reporting (Geographic Segments) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Segment Reporting Information [Line Items]
Revenue	$ 2,954.5	$ 2,840.9	$ 8,553.2	$ 8,559.3
Operating Segments | U.K.
Segment Reporting Information [Line Items]
Revenue	1,543.6	1,456.3	4,457.2	4,507.5
Operating Segments | Belgium
Segment Reporting Information [Line Items]
Revenue	746.6	721.9	2,147.2	2,147.0
Operating Segments | Switzerland
Segment Reporting Information [Line Items]
Revenue	315.0	311.7	930.9	942.7
Operating Segments | Ireland
Segment Reporting Information [Line Items]
Revenue	125.9	123.6	364.7	377.7
Operating Segments | Poland
Segment Reporting Information [Line Items]
Revenue	111.6	104.9	322.0	318.3
Operating Segments | Slovakia
Segment Reporting Information [Line Items]
Revenue	12.6	12.3	37.5	37.1
Other, including intersegment eliminations
Segment Reporting Information [Line Items]
Revenue	99.2	110.2	293.7	229.0
Equity Method Investment, Nonconsolidated Investee or Group of Investees | VodafoneZiggo JV
Segment Reporting Information [Line Items]
Revenue	$ 1,166.7	$ 1,096.9	$ 3,345.4	$ 3,275.3

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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