Derivative Instruments (Impact of Derivative Instruments on Borrowing Costs) (Details)	Sep. 30, 2021
Derivative [Line Items]
Impact of derivative instruments on borrowing costs	0.20%
UPC Holding
Derivative [Line Items]
Impact of derivative instruments on borrowing costs	0.15%
Telenet
Derivative [Line Items]
Impact of derivative instruments on borrowing costs	0.24%
VM Ireland
Derivative [Line Items]
Impact of derivative instruments on borrowing costs	0.42%