v3.26.3
Segment Reporting (Intersegment Expenses) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]        
Operating expenses: $ 1,938.7 $ 1,215.1 $ 4,358.5 $ 3,565.1
Performance measures percentage of segment revenue and operating cash flow presented     100.00%  
VMO2 JV (nonconsolidated)        
Segment Reporting [Line Items]        
Programming and other direct costs of services: 956.7 1,052.0 $ 2,799.3 3,064.8
Operating expenses: 1,098.2 1,133.7 3,426.2 3,375.0
Ziggo Group        
Segment Reporting [Line Items]        
Programming and other direct costs of services: 581.8 572.3 1,696.5 1,720.6
Operating expenses: 649.9 649.9 1,996.9 1,904.6
Reduction in operating expenses     19.0  
Wyre        
Segment Reporting [Line Items]        
Programming and other direct costs of services: 1.6 1.7 5.0 5.0
Operating expenses: 53.3 38.6 150.7 112.4
VM Ireland        
Segment Reporting [Line Items]        
Programming and other direct costs of services: 43.3 30.6 111.7 97.2
Operating expenses: $ 46.8 $ 49.8 $ 149.0 $ 143.2