Debt (Components of Debt) (Details) € in Millions, £ in Millions, $ in Millions	1 Months Ended
	May 07, 2020 EUR (€)	May 07, 2020 USD ($)	Mar. 31, 2020 GBP (£)	Mar. 31, 2020 EUR (€)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 GBP (£)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Weighted average interest rate			3.90%	3.90%	3.90%
Unused borrowing capacity					$ 2,880.0
Total debt before deferred financing costs, discounts and premiums					26,886.3		$ 27,648.1
Deferred financing costs, discounts and premiums, net					(68.5)		(82.7)
Total carrying amount of debt					26,817.8		27,565.4
Finance lease obligations (note 10)					580.7		617.1
Total debt and finance lease obligations					27,398.5		28,182.5
Current maturities of debt and finance lease obligations					(3,942.8)		(3,877.2)
Long-term debt and finance lease obligations					23,455.7		24,305.3
Debt, fair value					43.6		45.6
Significant other observable inputs (Level 2)
Debt Instrument [Line Items]
Debt, fair value					$ 43.6		45.6
VM Senior Secured Notes
Debt Instrument [Line Items]
Weighted average interest rate			5.34%	5.34%	5.34%
Unused borrowing capacity			£ 0.0		$ 0.0
Total debt before deferred financing costs, discounts and premiums					$ 5,672.7		5,916.9
VM Credit Facilities
Debt Instrument [Line Items]
Weighted average interest rate			3.19%	3.19%	3.19%
Unused borrowing capacity			£ 1,000.0		$ 1,239.8
Total debt before deferred financing costs, discounts and premiums					5,322.9		5,473.3
Current borrowing capacity			£ 921.6		$ 1,142.6
VM Senior Notes
Debt Instrument [Line Items]
Weighted average interest rate			5.35%	5.35%	5.35%
Unused borrowing capacity				€ 0.0	$ 0.0
Total debt before deferred financing costs, discounts and premiums					$ 1,568.2		1,583.8
Telenet Credit Facility (e)
Debt Instrument [Line Items]
Weighted average interest rate			2.55%	2.55%	2.55%
Unused borrowing capacity				€ 505.0	$ 554.0
Total debt before deferred financing costs, discounts and premiums					$ 3,512.8		3,541.4
Telenet Senior Secured Notes
Debt Instrument [Line Items]
Weighted average interest rate			4.71%	4.71%	4.71%
Unused borrowing capacity				€ 0.0	$ 0.0
Total debt before deferred financing costs, discounts and premiums					$ 1,658.3		1,673.7
UPCB SPE Notes
Debt Instrument [Line Items]
Weighted average interest rate			3.80%	3.80%	3.80%
Unused borrowing capacity				€ 0.0	$ 0.0
Total debt before deferred financing costs, discounts and premiums					$ 1,250.7		2,420.1
UPC Holding Bank Facility
Debt Instrument [Line Items]
Weighted average interest rate			3.40%	3.40%	3.40%
Unused borrowing capacity				€ 990.1	$ 1,086.2
Total debt before deferred financing costs, discounts and premiums					1,138.8		0.0
Current borrowing capacity				€ 828.8	$ 909.3
UPC Holding Senior Notes
Debt Instrument [Line Items]
Weighted average interest rate			4.61%	4.61%	4.61%
Unused borrowing capacity				€ 0.0	$ 0.0
Total debt before deferred financing costs, discounts and premiums					$ 1,187.0		1,202.3
Vendor financing
Debt Instrument [Line Items]
Weighted average interest rate			4.05%	4.05%	4.05%
Unused borrowing capacity					$ 0.0
Total debt before deferred financing costs, discounts and premiums					$ 3,609.6		3,748.2
ITV Collar Loan
Debt Instrument [Line Items]
Weighted average interest rate			0.90%	0.90%	0.90%
Unused borrowing capacity					$ 0.0
Total debt before deferred financing costs, discounts and premiums					$ 1,341.9		1,435.5
Derivative-related debt instruments
Debt Instrument [Line Items]
Weighted average interest rate			4.11%	4.11%	4.11%
Unused borrowing capacity					$ 0.0
Total debt before deferred financing costs, discounts and premiums					$ 76.8		81.1
Other
Debt Instrument [Line Items]
Weighted average interest rate			3.93%	3.93%	3.93%
Unused borrowing capacity					$ 0.0
Total debt before deferred financing costs, discounts and premiums					$ 546.6		571.8
Aggregate Variable and Fixed Rate Indebtedness
Debt Instrument [Line Items]
Weighted average interest rate			4.12%	4.12%	4.12%
VM Financing Facilities
Debt Instrument [Line Items]
Total debt before deferred financing costs, discounts and premiums			£ 68.0		$ 84.3	£ 103.6	128.4
Telenet Facility AG
Debt Instrument [Line Items]
Unused borrowing capacity				€ 400.0	438.9
Telenet Facility AP
Debt Instrument [Line Items]
Unused borrowing capacity				60.0	65.8
Telenet Overdraft Facility
Debt Instrument [Line Items]
Unused borrowing capacity				25.0	27.4
Telenet Revolving Facility
Debt Instrument [Line Items]
Unused borrowing capacity				20.0	21.9
Lionsgate Loan
Debt Instrument [Line Items]
Total carrying amount of debt					55.3
Line of credit upon completion of relevant compliance reporting requirements | VM Credit Facilities
Debt Instrument [Line Items]
Current borrowing capacity			£ 761.7		944.3
Line of credit upon completion of relevant compliance reporting requirements | UPC Holding Bank Facility
Debt Instrument [Line Items]
Current borrowing capacity				€ 652.0	715.3
Secured Debt | Virgin Media Collateralized Debt
Debt Instrument [Line Items]
Total carrying amount of debt					248.0		264.6
Long-term Debt
Debt Instrument [Line Items]
Debt, fair value					$ 25,700.0		$ 28,400.0
Subsequent Event | UPC Revolving Facility
Debt Instrument [Line Items]
Unused borrowing capacity	€ 500.0	$ 548.5
Subsequent Event | Telenet Facility X
Debt Instrument [Line Items]
Unused borrowing capacity	€ 510.0	$ 559.5
EURIBOR | Subsequent Event | UPC Revolving Facility
Debt Instrument [Line Items]
Basis spread on variable rate	2.50%
EURIBOR | Subsequent Event | Telenet Facility X
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%