Debt ( Component of Debt-Footnotes) (Details)	Sep. 30, 2023 EUR (€) facility	Sep. 30, 2023 USD ($) facility	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Weighted average interest rate	6.13%	6.13%
Unused borrowing capacity, amount | $		$ 1,542,600,000
Deferred liabilities | $		420,500,000	$ 428,100,000
Long-term Debt
Debt Instrument [Line Items]
Estimated fair value | $		$ 14,600,000,000	$ 12,600,000,000
Aggregate Variable and Fixed Rate Indebtedness
Debt Instrument [Line Items]
Weighted average interest rate	3.48%	3.48%
UPC Holding Bank Facility
Debt Instrument [Line Items]
Weighted average interest rate	7.66%	7.66%
UPC Holding Bank Facility | UPC Revolving Facility
Debt Instrument [Line Items]
Unused borrowing capacity, amount under covenant	€ 713,400,000	$ 754,600,000
Unused borrowing capacity, amount	713,400,000	754,600,000
Available to loan or distribute	713,400,000	754,600,000
UPC Holding Bank Facility | Debt Covenant, Scenario 1 | UPC Revolving Facility
Debt Instrument [Line Items]
Unused borrowing capacity, amount	713,400,000	754,600,000
Available to loan or distribute	€ 713,400,000	$ 754,600,000
Telenet Credit Facility
Debt Instrument [Line Items]
Weighted average interest rate	6.98%	6.98%
Telenet Credit Facility | UPC Revolving Facility
Debt Instrument [Line Items]
Unused borrowing capacity, amount under covenant	€ 645,000,000.0	$ 682,200,000
Unused borrowing capacity, amount	645,000,000.0	682,200,000
Available to loan or distribute	645,000,000.0	682,200,000
Telenet Credit Facility | Debt Covenant, Scenario 1 | UPC Revolving Facility
Debt Instrument [Line Items]
Unused borrowing capacity, amount	645,000,000.0	682,200,000
Available to loan or distribute	€ 645,000,000.0	$ 682,200,000
VM Ireland Credit Facility
Debt Instrument [Line Items]
Weighted average interest rate	7.31%	7.31%
Unused borrowing capacity, amount	€ 100,000,000	$ 105,800,000
VM Ireland Credit Facility | UPC Revolving Facility
Debt Instrument [Line Items]
Unused borrowing capacity, amount under covenant	100,000,000.0	105,800,000
Unused borrowing capacity, amount	100,000,000.0	105,800,000
Available to loan or distribute	100,000,000.0	105,800,000
VM Ireland Credit Facility | Debt Covenant, Scenario 1 | UPC Revolving Facility
Debt Instrument [Line Items]
Unused borrowing capacity, amount	100,000,000.0	105,800,000
Available to loan or distribute	100,000,000.0	105,800,000
UPC Revolving Facility One
Debt Instrument [Line Items]
Unused borrowing capacity, amount	713,400,000	754,600,000
Maximum borrowing capacity	736,400,000	778,900,000
Ancillary Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	23,000,000	24,300,000
UPC Revolving Facility
Debt Instrument [Line Items]
Unused borrowing capacity, amount | €	23,000,000
Telenet Revolving Credit Facility B
Debt Instrument [Line Items]
Unused borrowing capacity, amount	570,000,000	602,900,000
Maximum borrowing capacity | €	570,000,000
Telenet Revolving Credit Facility A
Debt Instrument [Line Items]
Unused borrowing capacity, amount	30,000,000	31,700,000
Maximum borrowing capacity | €	30,000,000
Telenet Overdraft Facility
Debt Instrument [Line Items]
Unused borrowing capacity, amount	25,000,000	26,400,000
Telenet Revolving Facility
Debt Instrument [Line Items]
Unused borrowing capacity, amount	20,000,000	21,200,000
Telenet Revolving Credit Facility I
Debt Instrument [Line Items]
Unused borrowing capacity, amount	€ 90,000,000	$ 95,200,000
Number of revolving facilities | facility	2	2