Derivative Instruments (Cross-currency Swap Contracts) (Details) - 6 months ended Jun. 30, 2025 - Telenet € in Millions, $ in Millions |
USD ($) |
EUR (€) |
|---|---|---|
| Cross-Currency Swap 4 | ||
| Derivative [Line Items] | ||
| Weighted average remaining life | 2 years 4 months 24 days | |
| Notional amount due from counterparty | Cross-Currency Swap 4 | ||
| Derivative [Line Items] | ||
| Notional amount | $ 3,890.0 | |
| Notional amount due from counterparty | Interest Rate Swap | ||
| Derivative [Line Items] | ||
| Notional amount | $ 4,246.3 | |
| Weighted average remaining life | 3 years 9 months 18 days | |
| Notional amount due to counterparty | Cross-Currency Swap 4 | ||
| Derivative [Line Items] | ||
| Notional amount | € | € 3,444.4 | |
| Notional amount due to counterparty | Interest Rate Swap | ||
| Derivative [Line Items] | ||
| Notional amount | $ 0.0 | |
| Weighted average remaining life | 0 years |