Derivative Instruments (Interest Rate Swap Contracts and Options) (Details) - Notional amount - Interest Rate Swap $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
UPC Holding
Derivative [Line Items]
Notional amount of derivative	$ 6,749.0
Weighted average remaining life	3 years 6 months
Telenet
Derivative [Line Items]
Notional amount of derivative	$ 3,337.1
Weighted average remaining life	3 years 6 months
UPC Holding
Derivative [Line Items]
Notional amount of derivative	$ 4,537.6
Weighted average remaining life	4 years 7 months 6 days
Telenet
Derivative [Line Items]
Notional amount of derivative	$ 1,651.2
Weighted average remaining life	2 years