v3.26.3
Acquisitions and Dispositions (Narrative) (Details)
€ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 08, 2026
USD ($)
Apr. 30, 2026
USD ($)
Apr. 30, 2026
EUR (€)
Sep. 30, 2026
USD ($)
Sep. 30, 2026
EUR (€)
Sep. 30, 2026
USD ($)
Sep. 08, 2026
EUR (€)
Jul. 31, 2026
USD ($)
Jul. 31, 2026
EUR (€)
Dec. 31, 2025
USD ($)
Business Combination [Line Items]                    
Held-for-sale assets       $ 811.2   $ 811.2       $ 125.8
Held-for-sale liabilities       126.1   126.1       28.4
Disposal group, disposed of by sale, not discontinued operations | UPC Slovakia                    
Business Combination [Line Items]                    
Net cash proceeds   $ 110.7 € 94.4              
Transaction consideration reduction settlement amount       0.5 € 0.4          
Disposed of by sale | UPC Slovakia                    
Business Combination [Line Items]                    
Held-for-sale assets                   122.5
Held-for-sale liabilities                   $ 18.2
Accumulated foreign currency translation losses   $ 3.8                
Disposed of by sale | O2 slovakia                    
Business Combination [Line Items]                    
Term of transitional services   42 months 42 months              
Revenue associated with transitional services       2.1            
Transitional period for continued brand use   3 years 3 years              
Held for sale | UPC Slovakia                    
Business Combination [Line Items]                    
Impairment charge           0.8        
Held-for-sale or disposed of by sale | VodafoneZiggo TowerCo Sale                    
Business Combination [Line Items]                    
Total consideration $ 758.6           € 669.0      
Lease back initial term 12 years                  
Assets held for sale       810.1   810.1        
Liabilities held for sale       $ 125.5   125.5        
VodafoneZiggo JV                    
Business Combination [Line Items]                    
Interest acquired (in percent)               50.00% 50.00%  
VodafoneZiggo Acquisition                    
Business Combination [Line Items]                    
Interest acquired (in percent)               100.00% 100.00%  
Business combination, acquired excluding accrued interest | €                 € 907.9  
Business combination, acquired               $ 1,045.6    
Revenue           771.7        
Net loss           $ 59.1