v3.25.2
Investments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Schedule of Investments [Line Items]          
Other current assets $ 502.3   $ 502.3   $ 411.6
Proceeds from sale of debt securities 0.0 $ 1,200.0 700.0 $ 2,300.0  
Realized net gains (losses) 0.0 1.1 0.5 (10.1)  
VMO2 JV          
Schedule of Investments [Line Items]          
Revenue 95.5 91.2 184.0 203.5  
VMO2 JV | Fixed Charges          
Schedule of Investments [Line Items]          
Revenue 56.7 48.7      
VMO2 JV | Variable Charges          
Schedule of Investments [Line Items]          
Revenue     38.8 42.5  
VMO2 JV | Related Party          
Schedule of Investments [Line Items]          
Other current assets 61.3   61.3   37.5
VMO2 JV | Related Party | Fixed Charges          
Schedule of Investments [Line Items]          
Revenue     110.8 97.6  
VMO2 JV | Related Party | Variable Charges          
Schedule of Investments [Line Items]          
Revenue     73.2 105.9  
VodafoneZiggo JV | Central and Other          
Schedule of Investments [Line Items]          
Revenue 48.2 $ 59.6 94.3 $ 121.7  
VodafoneZiggo JV | Related Party          
Schedule of Investments [Line Items]          
Other current assets $ 48.9   $ 48.9   $ 18.5