Segment Reporting (Revenue and Long-Lived Assets by Geographic Segments) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Revenue	$ 5,139.5	$ 5,207.2	$ 5,074.1	$ 4,588.0	$ 4,599.2	$ 4,597.4	$ 4,566.5	$ 4,516.9	$ 20,008.8	$ 18,280.0	$ 18,248.3
Long-lived assets	48,744.5				56,487.4				48,744.5	56,487.4
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									20,008.8	18,280.0	18,248.3
Operating Segments [Member] | Liberty Global Group [Member]
Segment Reporting Information [Line Items]
Revenue									17,285.0	17,062.7
Long-lived assets	36,739.3				54,145.0				36,739.3	54,145.0
Operating Segments [Member] | CWC [Member]
Segment Reporting Information [Line Items]
Revenue									1,444.8	0.0	0.0
Long-lived assets	9,534.8				0.0				9,534.8	0.0
Operating Segments [Member] | LiLAC Division [Member]
Segment Reporting Information [Line Items]
Revenue									2,725.1	1,217.3	1,204.6
Operating Segments [Member] | LiLAC Group [Member]
Segment Reporting Information [Line Items]
Revenue									2,723.8	1,217.3	1,204.6
Long-lived assets	12,005.2				2,342.4				12,005.2	2,342.4
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Long-lived assets	120.9				120.9				120.9	120.9
Geography Eliminations [Member] | Liberty Global Group [Member]
Segment Reporting Information [Line Items]
Revenue									18.6	18.8	45.9
Geography Eliminations [Member] | LiLAC Group [Member]
Segment Reporting Information [Line Items]
Revenue									(1.3)	0.0	0.0
U.K. | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									6,070.4	6,663.3	6,941.1
Long-lived assets	15,638.7				19,127.8				15,638.7	19,127.8
Belgium | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									2,691.1	2,021.0	2,279.4
Long-lived assets	4,961.8				3,674.9				4,961.8	3,674.9
The Netherlands | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									2,690.8	2,745.3	1,498.5
Long-lived assets	0.0				14,741.7				0.0	14,741.7
Germany | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									2,539.7	2,399.5	2,711.5
Long-lived assets	7,388.9				7,898.9				7,388.9	7,898.9
Switzerland | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									1,377.3	1,390.3	1,414.4
Long-lived assets	4,057.3				4,117.7				4,057.3	4,117.7
Ireland | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									438.4	395.4	468.8
Long-lived assets	648.7				662.1				648.7	662.1
Poland | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									391.4	399.7	469.9
Long-lived assets	840.9				893.2				840.9	893.2
Austria | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									378.3	367.9	431.7
Long-lived assets	997.0				990.3				997.0	990.3
Hungary | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									273.1	258.5	310.2
Long-lived assets	519.4				494.4				519.4	494.4
The Czech Republic | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									180.4	176.6	221.0
Long-lived assets	529.1				534.8				529.1	534.8
Romania | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									169.9	158.1	173.3
Long-lived assets	228.2				194.0				228.2	194.0
Slovakia | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									58.4	59.3	74.5
Long-lived assets	109.6				103.2				109.6	103.2
Other Europe | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									7.2	9.0	3.5
Long-lived assets	711.9				592.3				711.9	592.3
Total European Division | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									17,266.4	17,043.9	16,997.8
Long-lived assets	36,631.5				54,025.3				36,631.5	54,025.3
Total European Division | Operating Segments [Member] | Liberty Global Group [Member]
Segment Reporting Information [Line Items]
Revenue											17,043.7
U.S. and other | Operating Segments [Member]
Segment Reporting Information [Line Items]
Long-lived assets	107.8				119.7				107.8	119.7
Panama | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									414.8	0.0	0.0
Long-lived assets	2,330.0				0.0				2,330.0	0.0
CWC Networks [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Long-lived assets	1,547.1				0.0				1,547.1	0.0
Trinidad and Tobago | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									103.0	0.0	0.0
Long-lived assets	1,024.5				0.0				1,024.5	0.0
Jamaica | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									202.9	0.0	0.0
Long-lived assets	943.3				0.0				943.3	0.0
Bahamas | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									181.5	0.0	0.0
Long-lived assets	869.1				0.0				869.1	0.0
Barbados | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									143.1	0.0	0.0
Long-lived assets	645.1				0.0				645.1	0.0
Other Latin America and the Caribbean | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									399.5	0.0	0.0
Long-lived assets	2,175.7				0.0				2,175.7	0.0
Chile | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									859.5	838.1	898.5
Long-lived assets	993.9				873.7				993.9	873.7
Puerto Rico | Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenue									420.8	379.2	$ 306.1
Long-lived assets	$ 1,355.6				$ 1,347.8				$ 1,355.6	$ 1,347.8