Condensed Consolidated Statements of Comprehensive Earnings (Loss) (unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 318.7	$ (973.6)	$ 12,933.5	$ (459.7)
Other comprehensive earnings (loss), net of taxes:
Foreign currency translation adjustments	(940.8)	1,358.9	(894.0)	969.2
Reclassification adjustment included in net earnings (loss) (note 4)	1.8	0.1	1,251.2	0.2
Pension-related adjustments and other	0.1	(0.5)	2.8	(18.9)
Other comprehensive earnings (loss) from continuing operations	(938.9)	1,358.5	360.0	950.5
Other comprehensive earnings (loss) from discontinued operations (note 4)	(35.3)	19.9	(53.4)	(14.7)
Other comprehensive earnings (loss)	(974.2)	1,378.4	306.6	935.8
Comprehensive earnings (loss)	(655.5)	404.8	13,240.1	476.1
Comprehensive earnings attributable to noncontrolling interests	(41.6)	(49.5)	(144.1)	(131.1)
Comprehensive earnings (loss) attributable to Liberty Global shareholders	$ (697.1)	$ 355.3	$ 13,096.0	$ 345.0