Derivative Instruments (Cross-currency Derivative Contracts) (Details) - 6 months ended Jun. 30, 2017 € in Millions, £ in Millions, SFr in Millions, RON in Millions, PLN in Millions, JMD in Millions, HUF in Millions, CZK in Millions, CLP in Millions, $ in Millions	GBP (£)	HUF	CHF (SFr)	JMD	CZK	PLN	EUR (€)	USD ($)	CLP	RON
Virgin Media [Member]
Derivative [Line Items]
Notional amount of derivative instruments without exchange of notional amounts at inception and maturity								$ 514.4
Virgin Media [Member] | Cross-Currency Swap 1 [Member]
Derivative [Line Items]
Weighted average remaining life	5 years 6 months
Virgin Media [Member] | Cross-Currency Swap 2 [Member]
Derivative [Line Items]
Weighted average remaining life	6 years 2 months 12 days
Virgin Media [Member] | Cross-Currency Swap 3 [Member]
Derivative [Line Items]
Weighted average remaining life	2 years 3 months 18 days
UPC Holding [Member]
Derivative [Line Items]
Notional amount of derivative instruments without exchange of notional amounts at inception and maturity								432.8
UPC Holding [Member] | Cross-Currency Swap 4 [Member]
Derivative [Line Items]
Weighted average remaining life	6 years 4 months 24 days
UPC Holding [Member] | Cross-Currency Swap 5 [Member]
Derivative [Line Items]
Weighted average remaining life	7 years 2 months 12 days
UPC Holding [Member] | Cross-Currency Swap 6 [Member]
Derivative [Line Items]
Weighted average remaining life	6 years 7 months 6 days
UPC Holding [Member] | Cross-Currency Swap 7 [Member]
Derivative [Line Items]
Weighted average remaining life	5 years 7 months 6 days
UPC Holding [Member] | Cross-Currency Swap 8 [Member]
Derivative [Line Items]
Weighted average remaining life	3 years
UPC Holding [Member] | Cross-Currency Swap 9 [Member]
Derivative [Line Items]
Weighted average remaining life	4 years 6 months
UPC Holding [Member] | Cross-Currency Swap 10 [Member]
Derivative [Line Items]
Weighted average remaining life	4 years 2 months 12 days
UPC Holding [Member] | Cross-Currency Swap 11 [Member]
Derivative [Line Items]
Weighted average remaining life	4 years 7 months 6 days
Unitymedia [Member] | Cross-Currency Swap 12 [Member]
Derivative [Line Items]
Weighted average remaining life	6 years 2 months 12 days
Unitymedia [Member] | Cross-Currency Swap 13 [Member]
Derivative [Line Items]
Weighted average remaining life	5 years 6 months
Telenet [Member]
Derivative [Line Items]
Notional amount of derivative instruments without exchange of notional amounts at inception and maturity								593.5
Telenet [Member] | Cross-Currency Swap 14 [Member]
Derivative [Line Items]
Weighted average remaining life	7 years 7 months 6 days
Telenet [Member] | Cross-Currency Swap 15 [Member]
Derivative [Line Items]
Weighted average remaining life	7 years
CWC [Member] | Cross-Currency Swap 16 [Member]
Derivative [Line Items]
Weighted average remaining life	5 years 6 months
CWC [Member] | Cross-Currency Swap 17 [Member]
Derivative [Line Items]
Weighted average remaining life	1 year 8 months 12 days
VTR Finance [Member] | Cross-Currency Swap 18 [Member]
Derivative [Line Items]
Weighted average remaining life	4 years 9 months 18 days
Due From Counterparty [Member] | Virgin Media [Member] | Cross-Currency Swap 1 [Member]
Derivative [Line Items]
Notional amount of derivative								400.0
Due From Counterparty [Member] | Virgin Media [Member] | Cross-Currency Swap 2 [Member]
Derivative [Line Items]
Notional amount of derivative								8,933.0
Due From Counterparty [Member] | Virgin Media [Member] | Cross-Currency Swap 3 [Member]
Derivative [Line Items]
Notional amount of derivative | £	£ 30.3
Due From Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 4 [Member]
Derivative [Line Items]
Notional amount of derivative								2,390.0
Due From Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 5 [Member]
Derivative [Line Items]
Notional amount of derivative | €							€ 379.2
Due From Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 6 [Member]
Derivative [Line Items]
Notional amount of derivative								1,000.0
Due From Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 7 [Member]
Derivative [Line Items]
Notional amount of derivative | €							2,415.2
Due From Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 8 [Member]
Derivative [Line Items]
Notional amount of derivative | €							418.5
Due From Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 9 [Member]
Derivative [Line Items]
Notional amount of derivative | €							488.0
Due From Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 10 [Member]
Derivative [Line Items]
Notional amount of derivative | €							851.6
Due From Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 11 [Member]
Derivative [Line Items]
Notional amount of derivative | €							225.9
Due From Counterparty [Member] | Unitymedia [Member] | Cross-Currency Swap 12 [Member]
Derivative [Line Items]
Notional amount of derivative								3,305.0
Due From Counterparty [Member] | Unitymedia [Member] | Cross-Currency Swap 13 [Member]
Derivative [Line Items]
Notional amount of derivative | €							89.4
Due From Counterparty [Member] | Telenet [Member] | Cross-Currency Swap 14 [Member]
Derivative [Line Items]
Notional amount of derivative								2,300.0
Due From Counterparty [Member] | Telenet [Member] | Cross-Currency Swap 15 [Member]
Derivative [Line Items]
Notional amount of derivative | €							520.1
Due From Counterparty [Member] | CWC [Member] | Cross-Currency Swap 16 [Member]
Derivative [Line Items]
Notional amount of derivative								108.3
Due From Counterparty [Member] | CWC [Member] | Cross-Currency Swap 17 [Member]
Derivative [Line Items]
Notional amount of derivative | £	146.7
Due From Counterparty [Member] | VTR Finance [Member] | Cross-Currency Swap 18 [Member]
Derivative [Line Items]
Notional amount of derivative								1,400.0
Due To Counterparty [Member] | Virgin Media [Member] | Cross-Currency Swap 1 [Member]
Derivative [Line Items]
Notional amount of derivative | €							339.6
Due To Counterparty [Member] | Virgin Media [Member] | Cross-Currency Swap 2 [Member]
Derivative [Line Items]
Notional amount of derivative | £	£ 5,844.3
Due To Counterparty [Member] | Virgin Media [Member] | Cross-Currency Swap 3 [Member]
Derivative [Line Items]
Notional amount of derivative								50.0
Due To Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 4 [Member]
Derivative [Line Items]
Notional amount of derivative | €							1,973.7
Due To Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 5 [Member]
Derivative [Line Items]
Notional amount of derivative								425.0
Due To Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 6 [Member]
Derivative [Line Items]
Notional amount of derivative | SFr			SFr 922.0
Due To Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 7 [Member]
Derivative [Line Items]
Notional amount of derivative | SFr			SFr 2,781.0
Due To Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 8 [Member]
Derivative [Line Items]
Notional amount of derivative | CZK					CZK 11,521.8
Due To Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 9 [Member]
Derivative [Line Items]
Notional amount of derivative | HUF		HUF 138,437.5
Due To Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 10 [Member]
Derivative [Line Items]
Notional amount of derivative | PLN						PLN 3,604.5
Due To Counterparty [Member] | UPC Holding [Member] | Cross-Currency Swap 11 [Member]
Derivative [Line Items]
Notional amount of derivative | RON										RON 650.0
Due To Counterparty [Member] | Unitymedia [Member] | Cross-Currency Swap 12 [Member]
Derivative [Line Items]
Notional amount of derivative | €							2,562.1
Due To Counterparty [Member] | Unitymedia [Member] | Cross-Currency Swap 13 [Member]
Derivative [Line Items]
Notional amount of derivative								100.0
Due To Counterparty [Member] | Telenet [Member] | Cross-Currency Swap 14 [Member]
Derivative [Line Items]
Notional amount of derivative | €							€ 2,067.6
Due To Counterparty [Member] | Telenet [Member] | Cross-Currency Swap 15 [Member]
Derivative [Line Items]
Notional amount of derivative								595.0
Due To Counterparty [Member] | CWC [Member] | Cross-Currency Swap 16 [Member]
Derivative [Line Items]
Notional amount of derivative | JMD				JMD 13,817.5
Due To Counterparty [Member] | CWC [Member] | Cross-Currency Swap 17 [Member]
Derivative [Line Items]
Notional amount of derivative								$ 194.3
Due To Counterparty [Member] | VTR Finance [Member] | Cross-Currency Swap 18 [Member]
Derivative [Line Items]
Notional amount of derivative | CLP									CLP 951,390.0