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Segment Reporting (Performance Measures) (Schedule) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Segment Reporting Information [Line Items]        
Revenue $ 3,045.1 $ 2,774.9 $ 6,139.6 $ 5,444.7
Adjusted OIBDA 1,309.8 1,195.4 2,581.6 2,301.8
VodafoneZiggo JV        
Segment Reporting Information [Line Items]        
Revenue 1,114.5 1,081.3 2,296.1 2,165.2
Adjusted OIBDA 483.6 471.1 985.5 930.6
Operating Segments        
Segment Reporting Information [Line Items]        
Adjusted OIBDA 1,309.8 1,195.4 2,581.6 2,301.8
Operating Segments | U.K./Ireland        
Segment Reporting Information [Line Items]        
Revenue 1,734.9 1,566.1 3,513.1 3,070.5
Adjusted OIBDA 763.6 707.1 1,526.2 1,353.1
Operating Segments | Belgium        
Segment Reporting Information [Line Items]        
Revenue 753.9 686.0 1,513.5 1,347.4
Adjusted OIBDA 383.7 317.9 741.3 615.8
Operating Segments | Switzerland        
Segment Reporting Information [Line Items]        
Revenue 332.2 339.0 677.1 670.2
Adjusted OIBDA 189.0 212.9 375.5 417.7
Operating Segments | Central and Eastern Europe        
Segment Reporting Information [Line Items]        
Revenue 152.9 142.0 313.4 277.1
Adjusted OIBDA 67.9 64.6 139.8 123.1
Operating Segments | Central and Corporate        
Segment Reporting Information [Line Items]        
Revenue 72.0 42.7 123.8 83.5
Adjusted OIBDA (83.6) (98.7) (182.7) (191.7)
Intersegment eliminations        
Segment Reporting Information [Line Items]        
Revenue (0.8) (0.9) (1.3) (4.0)
Adjusted OIBDA $ (10.8) $ (8.4) $ (18.5) $ (16.2)