Debt and Capital Lease Obligations (VM Notes) (Details)	0 Months Ended								1 Months Ended				1 Months Ended			1 Months Ended
	Jul. 07, 2014 USD ($)	Mar. 28, 2014 VM Dollar Senior Secured Notes, 2025 [Member] USD ($)	Mar. 28, 2014 VM Sterling Senior Secured Notes, 2025 [Member] USD ($)	Mar. 28, 2014 VM Sterling Senior Secured Notes, 2025 [Member] GBP (£)	Apr. 30, 2014 Original 2029 VM Senior Secured Notes [Member]	Mar. 28, 2014 Original 2029 VM Senior Secured Notes [Member] USD ($)	Mar. 28, 2014 Original 2029 VM Senior Secured Notes [Member] GBP (£)	Mar. 14, 2014 Original 2029 VM Senior Secured Notes [Member]	Apr. 30, 2014 VM Sterling Senior Secured Notes, 2018 [Member] USD ($)	Apr. 30, 2014 VM Sterling Senior Secured Notes, 2018 [Member] GBP (£)	Apr. 30, 2014 Additional 2029 VM Senior Secured Notes [Member] USD ($)	Apr. 30, 2014 Additional 2029 VM Senior Secured Notes [Member] GBP (£)	Apr. 30, 2014 Senior Secured Notes Due 2018 [Member] USD ($)	Sep. 30, 2014 VM Senior Secured Notes, 2025 [Member]	Sep. 30, 2014 VM Senior Secured Notes, 2029 [Member]	Apr. 30, 2014 Virgin Media [Member] VM Facility C [Member] USD ($)	Apr. 30, 2014 Virgin Media [Member] VM Facility C [Member] GBP (£)	Apr. 30, 2014 Virgin Media [Member] VM Facility D [Member] USD ($)	Apr. 30, 2014 Virgin Media [Member] VM Facility D [Member] GBP (£)	Apr. 30, 2014 Virgin Media [Member] VM Facility E [Member] USD ($)	Apr. 30, 2014 Virgin Media [Member] VM Facility E [Member] GBP (£)
Debt Instrument [Line Items]
Interest rate		5.50%	5.50%	5.50%	6.25%			6.25%	7.00%				6.50%
Principal amount of debt		$ 425,000,000	$ 697,500,000	£ 430,000,000		$ 365,000,000	£ 225,000,000		$ 1,419,300,000	£ 875,000,000	$ 283,900,000	£ 175,000,000	$ 1,000,000,000			$ 973,200,000	£ 600,000,000	$ 162,200,000	£ 100,000,000	$ 1,377,800,000	£ 849,400,000
Extinguishment of debt																811,700,000	500,400,000
Issue price percent					101.75%
Additional basis points used to determine redemption premium														0.50%	0.50%
Gains (losses) on extinguishment of debt									5,200,000				(5,400,000)
Write-off of unamortized debt discounts	(900,000)								(61,800,000)				(33,900,000)
Redemption premiums									51,300,000				32,400,000
Write off of deferred debt issuance cost	$ 10,400,000								$ 5,300,000				$ 6,900,000
2019														102.75%
2020														101.833%
2021														100.00%	103.125%
2022														100.00%	102.083%
2023														100.00%	101.042%
2024														100.00%	100.00%
Mandatory redemption price on senior Notes in event that certain assets sold or specific control changed															101.00%