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Derivative Instruments (Cross-currency Derivative Contracts) (Details) - 3 months ended Mar. 31, 2019 € in Millions, £ in Millions, zł in Millions, SFr in Millions, Kč in Millions, Ft in Millions, $ in Millions, in Millions | GBP (£) | HUF (Ft) | CHF (SFr) | CZK (Kč) | PLN (zł) | EUR (€) | USD ($) | RON ( )
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Virgin Media |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative instruments without exchange of notional amounts at inception and maturity | $ |  |  |  |  |  |  | $ 4,700.0 |
Virgin Media | Cross-Currency Swap 1 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining life | 3 years 9 months 18 days |  |  |  |  |  |  |
Virgin Media | Cross-Currency Swap 2 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining life | 4 years 8 months 12 days |  |  |  |  |  |  |
Virgin Media | Cross-Currency Swap 3 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining life | 5 years 9 months 18 days |  |  |  |  |  |  |
UPC Holding | Cross-Currency Swap 4 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining life | 5 years 4 months 24 days |  |  |  |  |  |  |
UPC Holding | Cross-Currency Swap 5 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining life | 6 years |  |  |  |  |  |  |
UPC Holding | Cross-Currency Swap 6 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining life | 5 years 1 month 6 days |  |  |  |  |  |  |
UPC Holding | Cross-Currency Swap 7 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining life | 1 year 6 months |  |  |  |  |  |  |
UPC Holding | Cross-Currency Swap 8 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining life | 2 years 9 months 18 days |  |  |  |  |  |  |
UPC Holding | Cross-Currency Swap 9 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining life | 2 years 6 months |  |  |  |  |  |  |
UPC Holding | Cross-Currency Swap 10 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining life | 2 years 10 months 24 days |  |  |  |  |  |  |
Telenet | Cross-Currency Swap 11 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining life | 6 years 3 months 18 days |  |  |  |  |  |  |
Telenet | Cross-Currency Swap 12 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Weighted average remaining life | 6 years 2 months 12 days |  |  |  |  |  |  |
Notional amount due from counterparty | Virgin Media | Cross-Currency Swap 1 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | $ |  |  |  |  |  |  | 400.0 |
Notional amount due from counterparty | Virgin Media | Cross-Currency Swap 2 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | $ |  |  |  |  |  |  | 7,182.9 |
Notional amount due from counterparty | Virgin Media | Cross-Currency Swap 3 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | £ | £ 2,365.8 |  |  |  |  |  |  |
Notional amount due from counterparty | UPC Holding | Cross-Currency Swap 4 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | $ |  |  |  |  |  |  | 2,420.0 |
Notional amount due from counterparty | UPC Holding | Cross-Currency Swap 5 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | $ |  |  |  |  |  |  | 1,200.0 |
Notional amount due from counterparty | UPC Holding | Cross-Currency Swap 6 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  | € 2,824.4 |  |
Notional amount due from counterparty | UPC Holding | Cross-Currency Swap 7 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  | 299.2 |  |
Notional amount due from counterparty | UPC Holding | Cross-Currency Swap 8 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  | 375.5 |  |
Notional amount due from counterparty | UPC Holding | Cross-Currency Swap 9 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  | 822.9 |  |
Notional amount due from counterparty | UPC Holding | Cross-Currency Swap 10 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  | 217.2 |  |
Notional amount due from counterparty | Telenet | Cross-Currency Swap 11 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | $ |  |  |  |  |  |  | 3,670.0 |
Notional amount due from counterparty | Telenet | Cross-Currency Swap 12 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  | 1,431.2 |  |
Notional amount due to counterparty | Virgin Media | Cross-Currency Swap 1 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  | 339.6 |  |
Notional amount due to counterparty | Virgin Media | Cross-Currency Swap 2 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | £ | £ 4,759.3 |  |  |  |  |  |  |
Notional amount due to counterparty | Virgin Media | Cross-Currency Swap 3 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | $ |  |  |  |  |  |  | 3,400.0 |
Notional amount due to counterparty | UPC Holding | Cross-Currency Swap 4 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  | 1,999.4 |  |
Notional amount due to counterparty | UPC Holding | Cross-Currency Swap 5 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | SFr |  |  | SFr 1,107.5 |  |  |  |  |
Notional amount due to counterparty | UPC Holding | Cross-Currency Swap 6 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | SFr |  |  | SFr 3,221.2 |  |  |  |  |
Notional amount due to counterparty | UPC Holding | Cross-Currency Swap 7 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | Kč |  |  |  | Kč 8,221.8 |  |  |  |
Notional amount due to counterparty | UPC Holding | Cross-Currency Swap 8 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | Ft |  | Ft 105,911.9 |  |  |  |  |  |
Notional amount due to counterparty | UPC Holding | Cross-Currency Swap 9 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | zł |  |  |  |  | zł 3,484.5 |  |  |
Notional amount due to counterparty | UPC Holding | Cross-Currency Swap 10 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | |  |  |  |  |  |  |  | 610.0
Notional amount due to counterparty | Telenet | Cross-Currency Swap 11 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative |  |  |  |  |  | € 3,243.6 |  |
Notional amount due to counterparty | Telenet | Cross-Currency Swap 12 |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Notional amount of derivative | $ |  |  |  |  |  |  | $ 1,600.0 |

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Notional Amount of Derivative Instruments without Exchange of Notional Amounts at Inception and Maturity + References No definition available. + Details
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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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