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Segment Reporting (Geographic Segments) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]    
Revenue $ 1,868.4 $ 1,853.3
VMO2 JV    
Segment Reporting Information [Line Items]    
Revenue 3,162.7  
VodafoneZiggo JV    
Segment Reporting Information [Line Items]    
Revenue 1,083.4 1,130.0
Operating Segments | Switzerland    
Segment Reporting Information [Line Items]    
Revenue 807.4 821.4
Operating Segments | Belgium    
Segment Reporting Information [Line Items]    
Revenue 716.6 724.4
Operating Segments | Ireland    
Segment Reporting Information [Line Items]    
Revenue 123.0 127.8
Operating Segments | Slovakia    
Segment Reporting Information [Line Items]    
Revenue 13.3 12.9
Other, including intersegment eliminations    
Segment Reporting Information [Line Items]    
Revenue $ 208.1 $ 166.8