Debt (Financing Transactions) (Details)	1 Months Ended				3 Months Ended	12 Months Ended
	May 31, 2022 USD ($)	May 31, 2022 EUR (€)	Apr. 30, 2022 USD ($)	Apr. 30, 2022 EUR (€)	Mar. 31, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Apr. 30, 2022 EUR (€)
Debt Instrument [Line Items]
Losses (gains) on debt extinguishment, net						$ (2,800,000)	$ 90,600,000	$ 233,200,000
U.K. J.V. Entities
Debt Instrument [Line Items]
Non-cash borrowings and repayments of debt					$ 3,500,000,000	$ 0	2,900,000,000
UPC Holding
Debt Instrument [Line Items]
Losses (gains) on debt extinguishment, net	$ (4,800,000)		$ 2,000,000				90,600,000	43,100,000
Write off deferred financing costs	300,000		5,200,000
Net gain on settlement of discount	(5,100,000)		(4,700,000)
Payments of third party costs			1,500,000
Write-off of unamortized debt discount and deferred financing cost							77,700,000	(300,000)
Payment for debt redemption premium							$ 12,900,000	43,800,000
Telenet | Medium-term Notes
Debt Instrument [Line Items]
Losses (gains) on debt extinguishment, net								$ 18,900,000
3.875 % UPC Holding Senior Notes Debt
Debt Instrument [Line Items]
Extinguishment of debt	$ 54,900,000	€ 51,300,000	219,700,000	€ 205,100,000
Original issue amount			$ 636,500,000						€ 594,300,000
Stated interest percentage	3.875%	3.875%	3.875%						3.875%
5.5% UPC Holdings Senior Notes
Debt Instrument [Line Items]
Extinguishment of debt			$ 82,700,000
Original issue amount			$ 535,000,000
Stated interest percentage			5.50%						5.50%
UPC Facility AQ
Debt Instrument [Line Items]
Extinguishment of debt	$ 9,200,000	€ 8,600,000
UPC Facility AQ | UPC Holding Bank Facility
Debt Instrument [Line Items]
Repayments of lines of credit			$ 231,900,000	216,500,000
Maximum borrowing capacity			642,600,000						€ 600,000,000
UPC Facility AX | UPC Holding Bank Facility
Debt Instrument [Line Items]
Repayments of lines of credit			208,000,000
Maximum borrowing capacity			1,925,000,000
UPC Facility AY | UPC Holding Bank Facility
Debt Instrument [Line Items]
Repayments of lines of credit			181,500,000	€ 169,500,000
Maximum borrowing capacity			$ 923,800,000						€ 862,500,000