Segment Reporting (Reconciliation of Operating Cash Flow to Earnings from Continuing Operations) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Share-based compensation expense	$ (43.9)	$ (49.4)	$ (81.0)	$ (82.8)
Depreciation and amortization	(262.5)	(250.8)	(527.3)	(483.0)
Impairment, restructuring and other operating items, net	(15.5)	(5.5)	(56.3)	(3.8)
Operating income	3.0	29.6	26.8	90.3
Interest expense	(115.9)	(129.5)	(229.6)	(257.0)
Realized and unrealized gains (losses) on derivative instruments, net	18.2	(406.0)	150.4	(570.7)
Foreign currency transaction gains (losses), net	(122.6)	(2,089.9)	307.6	(3,170.9)
Realized and unrealized gains due to changes in fair values of certain investments, net	155.4	55.3	213.2	111.1
Share of results of affiliates, net	(289.9)	(264.6)	(311.6)	(412.6)
Other income, net	16.8	32.2	41.8	43.6
Earnings (loss) before income taxes	(335.0)	(2,772.9)	198.6	(4,166.2)
VMO2 JV And VodafoneZiggo JV
Segment Reporting [Line Items]
Adjusted EBITDA	1,650.4	1,669.0	3,224.2	3,205.5
Third-party and affiliate
Segment Reporting [Line Items]
Adjusted EBITDA	2,029.4	2,048.4	3,979.8	3,923.7
Third-party and affiliate \| Telenet
Segment Reporting [Line Items]
Adjusted EBITDA	197.0	185.1	380.9	340.9
Third-party and affiliate \| Wyre
Segment Reporting [Line Items]
Adjusted EBITDA	141.6	152.9	295.9	298.7
Third-party and affiliate \| VM Ireland
Segment Reporting [Line Items]
Adjusted EBITDA	40.4	41.4	78.8	78.6
Third-party and affiliate \| VMO2 JV (nonconsolidated)
Segment Reporting [Line Items]
Adjusted EBITDA	1,180.3	1,172.3	2,272.1	2,245.7
Third-party and affiliate \| VodafoneZiggo JV (nonconsolidated)
Segment Reporting [Line Items]
Adjusted EBITDA	470.1	496.7	952.1	959.8
Central and other
Segment Reporting [Line Items]
Adjusted EBITDA	43.7	34.1	44.0	38.3
Intersegment
Segment Reporting [Line Items]
Adjusted EBITDA	$ 10.4	$ 10.0	$ 20.2	$ 20.0

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