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Segment Reporting (Performance Measures) (Schedule) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Revenue $ 1,853.3 $ 3,499.9
Adjusted EBITDA 684.3 1,316.2
VMED O2 JV (U.K.) | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Segment Reporting Information [Line Items]    
Revenue 3,398.0 0.0
Adjusted EBITDA 1,395.3 0.0
VodafoneZiggo JV | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Segment Reporting Information [Line Items]    
Revenue 1,130.0 1,217.0
Adjusted EBITDA 537.8 565.2
Operating Segments | Switzerland    
Segment Reporting Information [Line Items]    
Revenue 821.4 841.8
Adjusted EBITDA 301.2 281.6
Operating Segments | Belgium    
Segment Reporting Information [Line Items]    
Revenue 724.4 772.7
Adjusted EBITDA 340.4 371.8
Operating Segments | Ireland    
Segment Reporting Information [Line Items]    
Revenue 127.8 136.1
Adjusted EBITDA 50.9 47.6
Operating Segments | U.K.    
Segment Reporting Information [Line Items]    
Revenue 0.0 1,635.0
Adjusted EBITDA 0.0 640.4
Corporate, Non-Segment    
Segment Reporting Information [Line Items]    
Revenue 181.4 120.3
Adjusted EBITDA (7.4) (26.3)
Intersegment eliminations    
Segment Reporting Information [Line Items]    
Revenue (1.7) (6.0)
Intersegment eliminations $ (0.8) $ 1.1