v3.10.0.1

Debt and Capital Lease Obligations (Footnotes) (Details) € in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018 EUR (€) association group	Dec. 31, 2018 USD ($) association group	Dec. 31, 2018 GBP (£) association group	Feb. 28, 2018 USD ($)	Feb. 28, 2018 GBP (£)	Dec. 31, 2017 EUR (€)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 GBP (£)
Debt Instrument [Line Items]
Weighted average interest rate	4.56%	4.56%	4.56%
Outstanding principal amount		$ 29,315.3					$ 32,178.0
Unused borrowing capacity		2,503.8	£ 0
Carrying value		29,183.9					32,006.2
Estimated fair value		248.6					926.6
Capital lease obligations		$ 621.3					638.3
Term of lease repayments	15 years
Number of borrowing groups | group	3	3	3
Significant other observable inputs (Level 2)
Debt Instrument [Line Items]
Estimated fair value		$ 248.6					304.9
Long-term Debt
Debt Instrument [Line Items]
Estimated fair value		$ 28,500.0					32,700.0
Aggregate Variable and Fixed Rate Indebtedness
Debt Instrument [Line Items]
Weighted average interest rate	4.31%	4.31%	4.31%
VM Financing Facilities
Debt Instrument [Line Items]
Outstanding principal amount		$ 53.4	£ 41,900,000				55.6	£ 43,600,000
VM Revolving Credit Facility
Debt Instrument [Line Items]
Unused borrowing capacity		860.3	675,000,000.0
VM Revolving Facility A
Debt Instrument [Line Items]
Facility amount				$ 63.7	£ 50,000,000.0
VM Revolving Facility B
Debt Instrument [Line Items]
Facility amount		796.6	£ 625,000,000.0
Telenet Facility AG
Debt Instrument [Line Items]
Unused borrowing capacity	€ 400.0	458.1
Telenet Overdraft Facility
Debt Instrument [Line Items]
Unused borrowing capacity	25.0	28.6
Telenet Revolving Facility
Debt Instrument [Line Items]
Unused borrowing capacity	€ 20.0	$ 22.9
Vendor financing
Debt Instrument [Line Items]
Weighted average interest rate	4.18%	4.18%	4.18%
Outstanding principal amount		$ 3,620.3					3,593.1
Unused borrowing capacity		0.0
General term of vendor financing arrangements for amounts due	1 year
Virgin Media Collateralized Debt | Secured Debt
Debt Instrument [Line Items]
Carrying value		225.9					160.9
Telenet Capital Lease PICs Network
Debt Instrument [Line Items]
Capital lease obligations	€ 390.6	$ 447.3				€ 361.8	$ 414.3
Number of associations of municipalities in belgium | association	4	4	4
Senior and Senior Secured Notes
Debt Instrument [Line Items]
Mandatory redemption price expressed as percentage of principal amount on senior notes in event that certain assets sold or specific control changed	101.00%	101.00%	101.00%
Redemption term	12 years
Redemption price, percentage of principal amount limitation	10.00%	10.00%	10.00%
Redemption price	103.00%
SPE Notes
Debt Instrument [Line Items]
Ownership percentage of SPEs by third parties	100.00%	100.00%	100.00%

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