Condensed Consolidated Statements of Comprehensive Earnings (Loss) (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,440.3	$ 1,017.7
Other comprehensive loss, net of taxes:
Foreign currency translation adjustments	(996.7)	(1,070.9)
Pension-related adjustments and other	(0.1)	(2.3)
Other comprehensive loss	(996.8)	(1,073.2)
Comprehensive earnings (loss)	443.5	(55.5)
Comprehensive earnings attributable to noncontrolling interests	(54.9)	(67.2)
Comprehensive earnings (loss) attributable to Liberty Global shareholders	$ 388.6	$ (122.7)