v3.26.3
Segment Reporting (Performance Measures) (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]        
Total consolidated revenue $ 1,920.6 $ 1,207.1 $ 4,367.2 $ 3,647.4
Performance measures percentage of segment revenue and operating cash flow presented     100.00%  
Nonconsolidated JV        
Segment Reporting [Line Items]        
Total consolidated revenue (3,645.6) (4,592.8) $ (12,370.5) (13,267.9)
Operating Segments        
Segment Reporting [Line Items]        
Total consolidated revenue 5,287.4 5,519.9 15,789.5 15,994.2
Operating Segments | VMO2 JV (nonconsolidated)        
Segment Reporting [Line Items]        
Total consolidated revenue 3,262.7 3,436.0 9,705.4 9,935.8
Operating Segments | Ziggo Group        
Segment Reporting [Line Items]        
Total consolidated revenue 1,871.5 1,929.7 5,613.2 5,606.7
Operating Segments | Wyre        
Segment Reporting [Line Items]        
Total consolidated revenue 34.6 32.0 102.9 90.9
Operating Segments | VM Ireland        
Segment Reporting [Line Items]        
Total consolidated revenue 118.6 122.2 368.0 360.8
Intersegment        
Segment Reporting [Line Items]        
Total consolidated revenue 194.2 181.9 575.6 525.4
Intersegment | Ziggo Group        
Segment Reporting [Line Items]        
Total consolidated revenue 35.0 12.9 88.0 39.5
Intersegment | Wyre        
Segment Reporting [Line Items]        
Total consolidated revenue 159.2 169.0 487.6 485.9
Total reportable segment revenue        
Segment Reporting [Line Items]        
Total consolidated revenue 5,481.6 5,701.8 16,365.1 16,519.6
Total reportable segment revenue | VMO2 JV (nonconsolidated)        
Segment Reporting [Line Items]        
Total consolidated revenue 3,262.7 3,436.0 9,705.4 9,935.8
Total reportable segment revenue | Ziggo Group        
Segment Reporting [Line Items]        
Total consolidated revenue 1,906.5 1,942.6 5,701.2 5,646.2
Total reportable segment revenue | Wyre        
Segment Reporting [Line Items]        
Total consolidated revenue 193.8 201.0 590.5 576.8
Total reportable segment revenue | VM Ireland        
Segment Reporting [Line Items]        
Total consolidated revenue 118.6 122.2 368.0 360.8
Central and other        
Segment Reporting [Line Items]        
Total consolidated revenue 356.4 328.4 1,116.7 1,050.6
Elimination of intercompany        
Segment Reporting [Line Items]        
Total consolidated revenue $ (271.8) $ (230.3) $ (744.1) $ (654.9)