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Earnings or Loss per Share (Schedules) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Earnings Per Share [Abstract] |  |
Loss from continuing operations | $ (306.9) | $ (1,367.2)
Net earnings from continuing operations attributable to noncontrolling interests | (8.7) | (6.1)
Net loss from continuing operations attributable to Liberty Global shareholders | $ (315.6) | $ (1,373.3)
Weighted average ordinary shares outstanding - basic and diluted (in shares) | 742,090,960 | 807,879,932

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