Segment Reporting (Performance Measures) (Schedule) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Revenues	$ 4,584.6	$ 5,074.1	$ 9,014.5	$ 9,662.1
Total consolidated capital expenditures			1,192.9	1,276.1
Adjusted OIBDA	2,101.3	2,305.7	4,059.9	4,421.2
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	4,584.6	5,074.1	9,014.5	9,662.1
Adjusted OIBDA	2,101.3	2,305.7	4,059.9	4,421.2
Operating Segments [Member] | European Operations Division U.K / Ireland [Member]
Segment Reporting Information [Line Items]
Revenues	1,566.1	1,717.7	3,070.5	3,404.2
Adjusted OIBDA	709.8	765.5	1,358.3	1,510.1
Operating Segments [Member] | European Operations Division Belgium [Member]
Segment Reporting Information [Line Items]
Revenues	686.0	707.3	1,347.4	1,317.5
Adjusted OIBDA	317.8	311.3	615.7	581.1
Operating Segments [Member] | European Operations Division Germany [Member]
Segment Reporting Information [Line Items]
Revenues	655.8	643.5	1,284.9	1,260.6
Adjusted OIBDA	412.8	400.3	795.6	779.7
Operating Segments [Member] | European Operations Division Switzerland / Austria [Member]
Segment Reporting Information [Line Items]
Revenues	435.1	447.0	858.8	880.4
Adjusted OIBDA	266.9	263.6	522.0	521.7
Operating Segments [Member] | European Operations Division Netherlands [Member]
Segment Reporting Information [Line Items]
Revenues	0.0	678.8	0.0	1,348.6
Adjusted OIBDA	0.0	364.1	0.0	732.0
Operating Segments [Member] | European Operations Division Total Western Europe [Member]
Segment Reporting Information [Line Items]
Revenues	3,343.0	4,194.3	6,561.6	8,211.3
Adjusted OIBDA	1,707.3	2,104.8	3,291.6	4,124.6
Operating Segments [Member] | European Operations Division Central and Eastern Europe [Member]
Segment Reporting Information [Line Items]
Revenues	288.6	274.0	559.9	540.1
Adjusted OIBDA	122.9	114.6	233.9	225.5
Operating Segments [Member] | European Operations Division Central and Other [Member]
Segment Reporting Information [Line Items]
Revenues	31.6	(0.9)	60.3	(3.3)
Adjusted OIBDA	(51.2)	(82.1)	(93.2)	(166.4)
Operating Segments [Member] | Total European Operations Division [Member]
Segment Reporting Information [Line Items]
Revenues	3,663.2	4,467.4	7,181.8	8,748.1
Adjusted OIBDA	1,779.0	2,137.3	3,432.3	4,183.7
Operating Segments [Member] | Liberty Global Group [Member]
Segment Reporting Information [Line Items]
Revenues	3,663.7	4,471.2	7,182.7	8,755.3
Adjusted OIBDA	1,733.3	2,074.6	3,338.0	4,068.2
Operating Segments [Member] | LiLAC Group CWC [Member]
Segment Reporting Information [Line Items]
Revenues	582.7	285.6	1,158.3	285.6
Adjusted OIBDA	224.1	101.0	437.2	101.0
Operating Segments [Member] | LiLAC Group Chile [Member]
Segment Reporting Information [Line Items]
Revenues	231.1	210.6	460.4	410.6
Adjusted OIBDA	92.3	81.8	183.9	158.1
Operating Segments [Member] | LiLAC Group Puerto Rico [Member]
Segment Reporting Information [Line Items]
Revenues	108.3	106.9	215.0	210.8
Adjusted OIBDA	53.8	50.0	105.1	96.8
Operating Segments [Member] | LiLAC Division [Member]
Segment Reporting Information [Line Items]
Revenues	922.1	603.1	1,833.7	907.0
Adjusted OIBDA	370.2	232.8	726.2	355.9
Operating Segments [Member] | LiLAC Group Corporate and Other [Member]
Segment Reporting Information [Line Items]
Adjusted OIBDA	(2.2)	(1.7)	(4.3)	(2.9)
Operating Segments [Member] | LiLAC Group [Member]
Segment Reporting Information [Line Items]
Revenues	920.9	602.9	1,831.8	906.8
Adjusted OIBDA	368.0	231.1	721.9	353.0
Intersegment Eliminations [Member] | Liberty Global Group [Member]
Segment Reporting Information [Line Items]
Revenues	0.0	(11.4)	0.0	(22.6)
Intersegment Eliminations [Member] | LiLAC Group [Member]
Segment Reporting Information [Line Items]
Revenues	(1.2)	(0.2)	(1.9)	(0.2)
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenues	0.5	15.2	0.9	29.8
Adjusted OIBDA	(45.7)	(62.7)	(94.3)	(115.5)
VodafoneZiggo JV [Member]
Segment Reporting Information [Line Items]
Revenues	31.8		63.3
Revenue	1,096.5	0.0	2,180.3	0.0
Adjusted OIBDA	$ 470.8	$ 0.0	$ 930.3	$ 0.0