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Segment Reporting (Balance Sheet Data of Reportable Segments) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Segment Reporting Information [Line Items] |  |
Long-lived assets | $ 28,470.7 | $ 28,629.0
Total assets | 49,046.3 | 53,153.6
VodafoneZiggo JV |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | 20,674.8 | 22,026.2
Total assets | 22,426.5 | 23,255.3
Operating Segments | U.K./Ireland |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | 16,170.9 | 16,254.6
Total assets | 20,665.5 | 20,702.5
Operating Segments | Belgium |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | 5,910.3 | 5,979.4
Total assets | 7,148.2 | 6,972.1
Operating Segments | Switzerland |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | 4,247.7 | 4,165.4
Total assets | 4,647.8 | 4,496.0
Operating Segments | Central and Eastern Europe |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | 1,062.2 | 1,087.4
Total assets | 1,135.2 | 1,130.8
Central and Corporate |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | 1,079.6 | 1,142.2
Total assets | 15,449.6 | 9,321.1
Total - continuing operations |  |
Segment Reporting Information [Line Items] |  |
Long-lived assets | 28,470.7 | 28,629.0
Total assets | $ 49,046.3 | $ 42,622.5

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