v3.10.0.1
Derivative Instruments (Impact of Derivative Instruments on Borrowing Costs) (Details)
Dec. 31, 2018
Derivative [Line Items]  
Increase (decrease) to borrowing costs (0.45%)
Virgin Media  
Derivative [Line Items]  
Increase (decrease) to borrowing costs (0.59%)
UPC Holding  
Derivative [Line Items]  
Increase (decrease) to borrowing costs (0.06%)
Telenet  
Derivative [Line Items]  
Increase (decrease) to borrowing costs (0.63%)