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Earnings or Loss per Share (Schedules) (Details) - USD ($) $ in Millions	3 Months Ended
	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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