Summary of Significant Accounting Policies (Earnings or Loss per Share) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Accounting Policies [Abstract]
Earnings (loss) from continuing operations	$ (3,873.8)	$ 1,105.3	$ 13,527.5
Net earnings attributable to noncontrolling interests	(177.9)	(513.1)	(183.3)
Net earnings (loss) from continuing operations attributable to Liberty Global shareholders	$ (4,051.7)	$ 592.2	$ 13,344.2
Weighted average common shares outstanding (basic EPS computation) (in shares)	425,679,037	489,555,582	555,695,224
Incremental shares attributable to the assumed exercise of outstanding options and SARs and the release of RSUs, RSAs and PSUs upon vesting (treasury stock method) (in shares)	0	7,433,268	13,418,999
Weighted average common shares outstanding (diluted EPS computation) (in shares)	425,679,037	496,988,850	569,114,223