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%) |