Long-lived Assets (Schedule of Intangible Assets Subject to Amortization, Net) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Gross carrying amount	$ 11,730.9	$ 12,377.9
Accumulated amortization	(3,731.4)	(3,188.1)
Net carrying amount	7,999.5	9,189.8
Customer Relationships [Member]
Gross carrying amount	11,524.2	12,142.5
Accumulated amortization	(3,610.8)	(3,056.3)
Net carrying amount	7,913.4	9,086.2
Other Intangible Assets [Member]
Gross carrying amount	206.7	235.4
Accumulated amortization	(120.6)	(131.8)
Net carrying amount	86.1	103.6
Liberty Global Group [Member]
Gross carrying amount	11,581.9	12,287.3
Accumulated amortization	(3,707.0)	(3,168.2)
Net carrying amount	7,874.9	9,119.1
Liberty Global Group [Member] | Customer Relationships [Member]
Gross carrying amount	11,375.4	12,052.5
Accumulated amortization	(3,586.5)	(3,037.0)
Net carrying amount	7,788.9	9,015.5
Liberty Global Group [Member] | Other Intangible Assets [Member]
Gross carrying amount	206.5	234.8
Accumulated amortization	(120.5)	(131.2)
Net carrying amount	86.0	103.6
LiLAC Group [Member]
Gross carrying amount	149.0	90.6
Accumulated amortization	(24.4)	(19.9)
Net carrying amount	124.6	70.7
LiLAC Group [Member] | Customer Relationships [Member]
Gross carrying amount	148.8	90.0
Accumulated amortization	(24.3)	(19.3)
Net carrying amount	124.5	70.7
LiLAC Group [Member] | Other Intangible Assets [Member]
Gross carrying amount	0.2	0.6
Accumulated amortization	(0.1)	(0.6)
Net carrying amount	$ 0.1	$ 0.0