Condensed Consolidated Statements of Equity (unaudited) - USD ($) $ in Millions	Total	Total Liberty Global shareholders	Ordinary shares Class A	Ordinary shares Class B	Ordinary shares Class C	Additional paid-in capital	Accumulated earnings	Accumulated other comprehensive earnings, net of taxes	Treasury shares, at cost	Non-controlling interests
Beginning balance at Dec. 31, 2019	$ 13,168.5	$ 13,575.9	$ 1.8	$ 0.1	$ 4.4	$ 6,136.9	$ 6,320.1	$ 1,112.7	$ (0.1)	$ (407.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	1,017.7	949.8					949.8			67.9
Other comprehensive earnings (loss) , net of tax	(1,073.2)	(1,072.5)						(1,072.5)		(0.7)
Repurchases and cancellations of Liberty Global ordinary shares	(224.4)	(224.4)			(0.1)	(224.3)
Share-based compensation (note 13)	46.1	46.1				46.1
Repurchases by Telenet of its outstanding shares	(38.1)	(45.3)				(45.3)				7.2
Adjustments due to changes in subsidiaries’ equity and other, net	15.6	14.5				14.5				1.1
Ending balance at Mar. 31, 2020	12,912.2	13,244.1	1.8	0.1	4.3	5,927.9	7,269.9	40.2	(0.1)	(331.9)
Beginning balance at Dec. 31, 2019	13,168.5	13,575.9	1.8	0.1	4.4	6,136.9	6,320.1	1,112.7	(0.1)	(407.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	(459.7)
Other comprehensive earnings (loss) , net of tax	935.8
Ending balance at Sep. 30, 2020	12,765.0	13,095.7	1.8	0.1	3.9	5,312.2	5,722.6	2,055.2	(0.1)	(330.7)
Beginning balance at Mar. 31, 2020	12,912.2	13,244.1	1.8	0.1	4.3	5,927.9	7,269.9	40.2	(0.1)	(331.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	(503.8)	(524.2)					(524.2)			20.4
Other comprehensive earnings (loss) , net of tax	630.6	636.6						636.6		(6.0)
Repurchases and cancellations of Liberty Global ordinary shares	(475.8)	(475.8)			(0.3)	(475.5)
Share-based compensation (note 13)	69.5	69.5				69.5
Adjustments due to changes in subsidiaries’ equity and other, net	(82.2)	(16.2)				(16.2)				(66.0)
Ending balance at Jun. 30, 2020	12,550.5	12,934.0	1.8	0.1	4.0	5,505.7	6,745.7	676.8	(0.1)	(383.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	(973.6)	(1,023.1)					(1,023.1)			49.5
Other comprehensive earnings (loss) , net of tax	1,378.4	1,378.4						1,378.4
Repurchases and cancellations of Liberty Global ordinary shares	(279.0)	(279.0)			(0.1)	(278.9)
Share-based compensation (note 13)	84.8	84.8				84.8
Adjustments due to changes in subsidiaries’ equity and other, net	3.9	0.6				0.6				3.3
Ending balance at Sep. 30, 2020	12,765.0	13,095.7	1.8	0.1	3.9	5,312.2	5,722.6	2,055.2	(0.1)	(330.7)
Beginning balance at Dec. 31, 2020	13,298.4	13,662.6	1.8	0.1	3.9	5,271.7	4,692.1	3,693.1	(0.1)	(364.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	1,440.3	1,385.4					1,385.4			54.9
Other comprehensive earnings (loss) , net of tax	(996.8)	(996.8)						(996.8)
Repurchases and cancellations of Liberty Global ordinary shares	(323.4)	(323.4)			(0.2)	(323.2)
Share-based compensation (note 13)	49.4	49.4				49.4
Adjustments due to changes in subsidiaries’ equity and other, net	20.2	18.8				18.8				1.4
Ending balance at Mar. 31, 2021	13,488.1	13,796.0	1.8	0.1	3.7	5,016.7	6,077.5	2,696.3	(0.1)	(307.9)
Beginning balance at Dec. 31, 2020	13,298.4	13,662.6	1.8	0.1	3.9	5,271.7	4,692.1	3,693.1	(0.1)	(364.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	12,933.5
Other comprehensive earnings (loss) , net of tax	306.6
Ending balance at Sep. 30, 2021	25,592.7	25,908.0	1.8	0.1	3.6	4,395.8	17,508.4	3,998.4	(0.1)	(315.3)
Beginning balance at Mar. 31, 2021	13,488.1	13,796.0	1.8	0.1	3.7	5,016.7	6,077.5	2,696.3	(0.1)	(307.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	11,174.5	11,128.2					11,128.2			46.3
Other comprehensive earnings (loss) , net of tax	2,277.6	2,276.3						2,276.3		1.3
Repurchases and cancellations of Liberty Global ordinary shares	(345.2)	(345.2)				(345.2)
Share-based compensation (note 13)	74.3	74.3				74.3
Adjustments due to changes in subsidiaries’ equity and other, net	(119.3)	(47.5)				(47.5)				(71.8)
Ending balance at Jun. 30, 2021	26,550.0	26,882.1	1.8	0.1	3.7	4,698.3	17,205.7	4,972.6	(0.1)	(332.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss)	318.7	277.1					277.1			41.6
Other comprehensive earnings (loss) , net of tax	(974.2)	(974.2)						(974.2)
Repurchases and cancellations of Liberty Global ordinary shares	(358.1)	(358.1)			(0.1)	(358.0)
Share-based compensation (note 13)	58.6	58.6				58.6
Adjustments due to changes in subsidiaries’ equity and other, net	(2.3)	22.5				(3.1)	25.6			(24.8)
Ending balance at Sep. 30, 2021	$ 25,592.7	$ 25,908.0	$ 1.8	$ 0.1	$ 3.6	$ 4,395.8	$ 17,508.4	$ 3,998.4	$ (0.1)	$ (315.3)