Debt (Maturities of Debt) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Instrument [Line Items]
2025 (remainder of year)	$ 889.1
2026	1,104.4
2027	23.1
2028	4,354.0
2029	2,196.6
2030	24.1
Thereafter	813.1
Total debt maturities	9,404.4	$ 9,145.0
Deferred financing costs, discounts and premiums, net	(65.2)
Total debt	9,339.2
Current portion	1,120.1
Long-term portion	8,219.1
Vodafone Collar Loan
Debt Instrument [Line Items]
Total debt maturities	1,360.1	$ 1,301.9
Telenet
Debt Instrument [Line Items]
2025 (remainder of year)	567.6
2026	65.2
2027	23.1
2028	4,354.0
2029	1,223.6
2030	24.1
Thereafter	813.1
Total debt maturities	7,070.7
Deferred financing costs, discounts and premiums, net	(17.0)
Total debt	7,053.7
Current portion	610.1
Long-term portion	6,443.6
VM Ireland
Debt Instrument [Line Items]
2025 (remainder of year)	0.0
2026	0.0
2027	0.0
2028	0.0
2029	973.0
2030	0.0
Thereafter	0.0
Total debt maturities	973.0
Deferred financing costs, discounts and premiums, net	(4.1)
Total debt	968.9
Current portion	0.0
Long-term portion	968.9
Other
Debt Instrument [Line Items]
2025 (remainder of year)	321.5
2026	1,039.2
2027	0.0
2028	0.0
2029	0.0
2030	0.0
Thereafter	0.0
Total debt maturities	1,360.7
Deferred financing costs, discounts and premiums, net	(44.1)
Total debt	1,316.6
Current portion	510.0
Long-term portion	$ 806.6