v3.26.3
Investments (Equity Method Investments) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Schedule of Equity Method Investments [Line Items]        
Equity method investment $ (191.2) $ (43.3) $ (502.8) $ (455.9)
VMO2 JV        
Schedule of Equity Method Investments [Line Items]        
Equity method investment (217.7) (11.2) (442.3) (258.9)
nexfibre JV        
Schedule of Equity Method Investments [Line Items]        
Equity method investment (8.0) (10.8) (35.4) (53.0)
VodafoneZiggo JV        
Schedule of Equity Method Investments [Line Items]        
Equity method investment $ 27.6 2.7 $ (11.3) (68.0)
Percent of interest income earned on loan included in investment 100.00%   100.00%  
AtlasEdge JV        
Schedule of Equity Method Investments [Line Items]        
Equity method investment $ 8.5 (23.2) $ (9.6) (57.7)
Other, net        
Schedule of Equity Method Investments [Line Items]        
Equity method investment $ (1.6) $ (0.8) $ (4.2) $ (18.3)