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Derivative Instruments (Cross-currency Swap Contracts) (Details) - 3 months ended Mar. 31, 2025 - Telenet
€ in Millions, $ in Millions
USD ($)
EUR (€)
Cross-Currency Swap 4    
Derivative [Line Items]    
Weighted average remaining life 2 years 3 months 18 days  
Notional amount due from counterparty | Cross-Currency Swap 4    
Derivative [Line Items]    
Notional amount $ 3,295.0  
Notional amount due from counterparty | Interest Rate Swap    
Derivative [Line Items]    
Notional amount $ 3,903.0  
Weighted average remaining life 4 years 1 month 6 days  
Notional amount due to counterparty | Cross-Currency Swap 4    
Derivative [Line Items]    
Notional amount | €   € 2,924.3
Notional amount due to counterparty | Interest Rate Swap    
Derivative [Line Items]    
Notional amount $ 0.0