Debt (Components of Debt) (Details) € in Millions, $ in Millions	Mar. 31, 2024 USD ($)	Mar. 31, 2024 EUR (€)	Dec. 31, 2023 USD ($)	Mar. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
Weighted average interest rate	6.09%	6.09%
Unused borrowing capacity, amount	$ 1,535.4
Total debt before deferred financing costs, discounts and premiums	15,602.5		$ 15,857.6
Deferred financing costs, discounts and premiums, net	(134.4)		(149.7)
Total carrying amount of debt	15,468.1		15,707.9
Finance lease obligations	52.3		58.0
Total debt and finance lease obligations	15,520.4		15,765.9
Current portion of debt and finance lease obligations	(737.8)		(806.8)
Long-term debt and finance lease obligations	$ 14,782.6		14,959.1
Sunrise Holding Bank Facility
Debt Instrument [Line Items]
Weighted average interest rate	7.70%	7.70%
Unused borrowing capacity, amount	$ 763.4	€ 707.0
Total debt before deferred financing costs, discounts and premiums	3,597.1		3,626.4
Sunrise Holding Bank Facility | Sunrise Holding Revolving Facility
Debt Instrument [Line Items]
Unused borrowing capacity, amount	$ 763.4	€ 707.0
Sunrise Holding SPE Notes
Debt Instrument [Line Items]
Weighted average interest rate	4.57%	4.57%
Total debt before deferred financing costs, discounts and premiums	$ 1,654.8		1,664.9
Sunrise Holding Senior Notes
Debt Instrument [Line Items]
Weighted average interest rate	4.77%	4.77%
Total debt before deferred financing costs, discounts and premiums	$ 817.1		826.1
Telenet Credit Facility
Debt Instrument [Line Items]
Weighted average interest rate	6.95%	6.95%
Total debt before deferred financing costs, discounts and premiums	$ 4,454.3		4,507.9
Telenet Credit Facility | Sunrise Holding Revolving Facility
Debt Instrument [Line Items]
Unused borrowing capacity, amount	$ 664.0	€ 615.0
Telenet Senior Secured Notes
Debt Instrument [Line Items]
Weighted average interest rate	4.76%	4.76%
Total debt before deferred financing costs, discounts and premiums	$ 1,583.0		1,597.6
VM Ireland Credit Facility
Debt Instrument [Line Items]
Weighted average interest rate	7.36%	7.36%
Unused borrowing capacity, amount	$ 108.0	€ 100.0
Total debt before deferred financing costs, discounts and premiums	971.7		995.8
VM Ireland Credit Facility | Sunrise Holding Revolving Facility
Debt Instrument [Line Items]
Unused borrowing capacity, amount	$ 108.0	€ 100.0
Vodafone Collar Loan
Debt Instrument [Line Items]
Weighted average interest rate	2.95%	2.95%
Total debt before deferred financing costs, discounts and premiums	$ 1,358.2		1,391.9
Vendor financing
Debt Instrument [Line Items]
Weighted average interest rate	4.97%	4.97%
Total debt before deferred financing costs, discounts and premiums	$ 708.0		768.7	$ 655.3	$ 704.7
Other
Debt Instrument [Line Items]
Weighted average interest rate	5.90%	5.90%
Total debt before deferred financing costs, discounts and premiums	$ 458.3		$ 478.3