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Segment Reporting (Revenue and Long-Lived Assets by Geographic Segments) (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									$ 11,541.5	$ 11,957.9	$ 11,276.4
Long-lived assets	$ 28,470.7				$ 28,629.0				28,470.7	28,629.0
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
VodafoneZiggo JV
Segment Reporting Information [Line Items]
Long-lived assets	20,674.8				22,026.2				20,674.8	22,026.2
Revenue									4,407.8	4,602.2	4,512.5
U.K.
Segment Reporting Information [Line Items]
Long-lived assets	15,422.4				15,489.2				15,422.4	15,489.2
Belgium
Segment Reporting Information [Line Items]
Long-lived assets	5,910.3				5,979.4				5,910.3	5,979.4
Switzerland
Segment Reporting Information [Line Items]
Long-lived assets	4,247.7				4,165.4				4,247.7	4,165.4
Ireland
Segment Reporting Information [Line Items]
Long-lived assets	748.5				765.4				748.5	765.4
Poland
Segment Reporting Information [Line Items]
Long-lived assets	937.0				958.7				937.0	958.7
Slovakia
Segment Reporting Information [Line Items]
Long-lived assets	125.2				128.7				125.2	128.7
U.S. and other
Segment Reporting Information [Line Items]
Long-lived assets	1,079.6				1,142.2				1,079.6	1,142.2
Operating Segments \| U.K.
Segment Reporting Information [Line Items]
Revenue									6,086.2	6,351.2	5,927.9
Operating Segments \| Belgium
Segment Reporting Information [Line Items]
Revenue									2,893.0	2,993.6	2,865.3
Operating Segments \| Switzerland
Segment Reporting Information [Line Items]
Revenue									1,258.8	1,326.0	1,370.1
Operating Segments \| Ireland
Segment Reporting Information [Line Items]
Revenue									514.1	523.9	470.8
Operating Segments \| Poland
Segment Reporting Information [Line Items]
Revenue									425.7	440.7	417.9
Operating Segments \| Slovakia
Segment Reporting Information [Line Items]
Revenue									49.7	51.5	49.6
Geography Eliminations
Segment Reporting Information [Line Items]
Revenue									314.0	271.0	$ 174.8
Total - continuing operations
Segment Reporting Information [Line Items]
Long-lived assets	$ 28,470.7				$ 28,629.0				$ 28,470.7	$ 28,629.0