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Debt (Narrative) (Details) € in Millions, $ in Millions	1 Months Ended					2 Months Ended	3 Months Ended		9 Months Ended
Debt (Narrative) (Details) € in Millions, $ in Millions	Aug. 31, 2026 USD ($)	Aug. 31, 2026 EUR (€)	Jul. 31, 2026 USD ($)	May 31, 2026 USD ($)	Apr. 30, 2026 USD ($)	Aug. 31, 2026 USD ($)	Sep. 30, 2026 USD ($) group	Sep. 30, 2026 EUR (€)	Sep. 30, 2026 USD ($) group subsidiary	Sep. 30, 2025 USD ($)	Jul. 31, 2026 EUR (€)	May 31, 2026 EUR (€)	Feb. 28, 2026 USD ($)	Feb. 28, 2026 EUR (€)	Dec. 31, 2025 USD ($)
Debt Instrument [Line Items]
Number of subsidiaries with the most outstanding debt \| subsidiary									3
Number of borrowing groups \| group							4		4
Maturity term				7 years
Long-term debt							$ 20,523.2		$ 20,523.2						$ 8,561.8
Repayment of debt									$ 3,032.6	$ 663.1
Minimum
Debt Instrument [Line Items]
Stated interest percentage				2.35%								2.35%
Maximum
Debt Instrument [Line Items]
Stated interest percentage				3.25%								3.25%
Senior notes due 2028
Debt Instrument [Line Items]
Purchased and extinguished					$ 28.4	$ 158.5
Principal amount	$ 971.6				$ 1,000.0	$ 971.6
Stated interest percentage					5.50%
Wyre Facility
Debt Instrument [Line Items]
Stated interest percentage	5.00%					5.00%
Repayment of debt	$ 320.9	€ 283.0
Wyre Facility \| Line of credit \| Secured debt
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 3,100.0								€ 2,700.0
Long-term debt			$ 3,300.0								€ 2,900.0
Proceeds from lines of credit							$ 85.0	€ 75.0
Wyre Capex Term Facility
Debt Instrument [Line Items]
Principal amount				1,400.0								1,200.0	$ 567.0	€ 500.0
Repayment of debt	144.0	127.3
Wyre Capex Term Facility \| Line of credit \| Secured debt
Debt Instrument [Line Items]
Long-term debt			242.7								214.0
Wyre Revolving Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				243.8								215.0
Wyre DSR Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 266.5								€ 235.0
Wyre Term Facility
Debt Instrument [Line Items]
Repayment of debt	$ 176.9	€ 155.7
Wyre Term Facility \| Line of credit \| Secured debt
Debt Instrument [Line Items]
Long-term debt			3,100.0								2,700.0
Telenet Term Loan AR
Debt Instrument [Line Items]
Repayment of debt						$ 2,295.0
Financing Facility \| Line of credit \| Liberty Global Europe Holdings BV
Debt Instrument [Line Items]
Principal amount			$ 340.2								€ 300.0
Maturity term			3 years
Financing Facility \| Line of credit \| Minimum \| Liberty Global Europe Holdings BV
Debt Instrument [Line Items]
Basis spread on variable rate			2.75%
Financing Facility \| Line of credit \| Maximum \| Liberty Global Europe Holdings BV
Debt Instrument [Line Items]
Basis spread on variable rate			4.75%