Segment Reporting (Geographic Segments) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Total	$ 4,566.5	$ 4,602.2	$ 9,083.4	$ 9,135.9
European Operations Division United Kingdom [Member]
Segment Reporting Information [Line Items]
Total	1,662.4	1,774.6	3,274.4	3,502.5
European Operations Division Netherlands [Member]
Segment Reporting Information [Line Items]
Total	683.9	316.3	1,391.3	634.4
European Operations Division Germany [Member]
Segment Reporting Information [Line Items]
Total	591.0	688.8	1,188.9	1,384.7
European Operations Division Belgium [Member]
Segment Reporting Information [Line Items]
Total	500.3	582.4	1,003.0	1,156.6
European Operations Division Switzerland [Member]
Segment Reporting Information [Line Items]
Total	357.3	365.3	704.1	718.1
European Operations Division Poland [Member]
Segment Reporting Information [Line Items]
Total	101.2	121.2	202.2	241.7
European Operations Division Ireland [Member]
Segment Reporting Information [Line Items]
Total	97.2	122.1	196.6	241.7
European Operations Division Austria [Member]
Segment Reporting Information [Line Items]
Total	91.5	111.4	184.0	222.4
European Operations Division Hungary [Member]
Segment Reporting Information [Line Items]
Total	65.2	80.6	130.2	159.3
European Operations Division Czech Republic [Member]
Segment Reporting Information [Line Items]
Total	43.8	57.5	88.2	116.3
European Operations Division Romania [Member]
Segment Reporting Information [Line Items]
Total	38.7	43.5	77.6	87.0
European Operations Division Slovakia [Member]
Segment Reporting Information [Line Items]
Total	14.8	19.6	30.0	38.8
European Operations Division Other Europe [Member]
Segment Reporting Information [Line Items]
Total	2.5	0.9	3.4	3.3
Total European Operations Division [Member]
Segment Reporting Information [Line Items]
Total	4,249.8	4,284.2	8,473.9	8,506.8
Other, Including Intersegment Eliminations
Segment Reporting Information [Line Items]
Total	5.3	11.6	10.3	22.8
Liberty Global Group [Member]
Segment Reporting Information [Line Items]
Total	4,255.1	4,295.8	8,484.2	8,529.6
LiLAC Group Chile [Member]
Segment Reporting Information [Line Items]
Total	220.8	229.8	429.6	455.1
LiLAC Group Puerto Rico [Member]
Segment Reporting Information [Line Items]
Total	90.6	76.6	169.6	151.3
LiLAC Group [Member]
Segment Reporting Information [Line Items]
Total	311.4	306.4	599.2	606.4
Inter-group Eliminations [Member]
Segment Reporting Information [Line Items]
Total	$ 0.0	$ 0.0	$ 0.0	$ (0.1)