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Segment Reporting (Performance Measures) (Schedule) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Segment Reporting Information [Line Items]    
Revenue $ 3,615.3 $ 2,875.8
Adjusted EBITDA 1,367.3 1,150.3
VodafoneZiggo JV    
Segment Reporting Information [Line Items]    
Adjusted EBITDA 565.2 502.8
VodafoneZiggo JV | Equity Method Investment, Nonconsolidated Investee or Group of Investees    
Segment Reporting Information [Line Items]    
Revenue 1,217.0 1,097.1
Operating Segments | U.K./Ireland    
Segment Reporting Information [Line Items]    
Revenue 1,770.7 1,620.6
Adjusted EBITDA 692.6 655.4
Operating Segments | Belgium    
Segment Reporting Information [Line Items]    
Revenue 772.7 718.1
Adjusted EBITDA 371.8 331.6
Operating Segments | Switzerland    
Segment Reporting Information [Line Items]    
Revenue 841.8 316.8
Adjusted EBITDA 281.6 134.1
Operating Segments | Central and Eastern Europe    
Segment Reporting Information [Line Items]    
Revenue 128.6 119.1
Adjusted EBITDA 57.0 54.3
Corporate, Non-Segment    
Segment Reporting Information [Line Items]    
Revenue 102.7 101.2
Adjusted EBITDA (35.7) (25.1)
Intersegment eliminations    
Segment Reporting Information [Line Items]    
Revenue $ (1.2) $ 0.0