Derivative Instruments (Interest Rate Swap Contracts, Options and Basis Swaps) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)
Basis Swaps | UPC Holding
Derivative [Line Items]
Weighted average remaining life	6 months
Basis Swaps | Telenet
Derivative [Line Items]
Weighted average remaining life	6 months
Notional amount due from counterparty | Interest Rate Swap | UPC Holding
Derivative [Line Items]
Notional amount	$ 6,917.4
Weighted average remaining life	3 years 3 months 18 days
Notional amount due from counterparty | Interest Rate Swap | Telenet
Derivative [Line Items]
Notional amount	$ 3,284.1
Weighted average remaining life	3 years 2 months 12 days
Notional amount due from counterparty | Basis Swaps | UPC Holding
Derivative [Line Items]
Notional amount	$ 5,250.0
Notional amount due from counterparty | Basis Swaps | Telenet
Derivative [Line Items]
Notional amount	4,590.0
Notional amount due to counterparty | Interest Rate Swap | UPC Holding
Derivative [Line Items]
Notional amount	$ 4,583.7
Weighted average remaining life	4 years 3 months 18 days
Notional amount due to counterparty | Interest Rate Swap | Telenet
Derivative [Line Items]
Notional amount	$ 1,624.9
Weighted average remaining life	1 year 8 months 12 days