v3.26.3
Segment Reporting (Capital Expenditures of Reportable Segments) (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]    
Total consolidated property and equipment additions $ 1,317.0 $ 938.4
Assets acquired under capital-related vendor financing arrangements (144.4) (72.7)
Assets acquired under finance leases (1.0) 0.0
Changes in current liabilities related to capital expenditures (5.2) 39.8
Total capital expenditures, net $ 1,166.4 905.5
Performance measures percentage of segment revenue and operating cash flow presented 100.00%  
Nonconsolidated JV    
Segment Reporting [Line Items]    
Total consolidated property and equipment additions $ 2,463.8 2,588.3
Operating Segments | Consolidated reportable segments    
Segment Reporting [Line Items]    
Total consolidated property and equipment additions 3,678.1 3,514.4
Operating Segments | Ziggo Group    
Segment Reporting [Line Items]    
Total consolidated property and equipment additions 1,100.7 1,093.7
Operating Segments | Wyre    
Segment Reporting [Line Items]    
Total consolidated property and equipment additions 589.4 345.4
Operating Segments | VM Ireland    
Segment Reporting [Line Items]    
Total consolidated property and equipment additions 126.0 160.5
Operating Segments | VMO2 JV (nonconsolidated)    
Segment Reporting [Line Items]    
Total consolidated property and equipment additions 1,862.0 1,914.8
Central and other    
Segment Reporting [Line Items]    
Total consolidated property and equipment additions 129.9 42.3
Intersegment    
Segment Reporting [Line Items]    
Total consolidated property and equipment additions $ (27.2) $ (30.0)