SCHEDULE I (Parent Company Information) CONDENSED STATEMENT OF CASH FLOWS (Details) - Liberty Global Plc - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net earnings (loss)	$ 11,521.4	$ 725.3	$ (2,778.1)
Adjustments to reconcile loss from continuing operations to net cash provided by operating activities from continuing operations:
Equity in losses (earnings) of consolidated subsidiaries, net	(11,921.4)	(887.9)	2,386.0
Share-based compensation expense	35.8	20.6	19.8
Related-party fees and allocations	20.6	8.0	55.2
Depreciation and amortization	1.4	1.5	1.0
Other operating expenses	0.2	0.0	0.0
Foreign currency transaction losses (gains), net	(281.2)	(381.0)	644.8
Deferred income tax benefit	(10.0)	(2.8)	(1.6)
Changes in operating assets and liabilities:
Receivables and other operating assets	(213.7)	(134.8)	502.7
Payables and accruals	554.3	564.4	(160.9)
Net cash provided by operating activities	(292.6)	(86.7)	668.9
Cash flows from investing activities:
Distribution and repayments from (investments in and advances to) consolidated subsidiaries, net	(142.8)	(93.4)	1,188.7
Funding of the Vodafone Escrow Accounts, net	(295.2)	0.0	0.0
Other investing activities, net	(0.1)	0.0	(7.0)
Net cash provided (used) by investing activities	(438.1)	(93.4)	1,181.7
Cash flows from financing activities:
Borrowings of related-party debt	5,870.5	3,133.3	4,632.7
Repayments of related-party debt	(2,018.6)	(1,010.0)	(3,496.0)
Repurchase of Liberty Global ordinary shares	(3,219.4)	(2,009.9)	(2,976.2)
Borrowings of third-party debt	98.6	0.0	0.0
Other financing activities, net	(5.0)	4.3	3.6
Net cash used by financing activities	726.1	117.7	(1,835.9)
Effect of exchange rate changes on cash	0.5	0.0	(0.4)
Total	(4.1)	(62.4)	14.3
Cash and cash equivalents:
Beginning of period	16.0	78.4	64.1
End of period	11.9	16.0	78.4
Details of end of period cash and cash equivalents and restricted cash:
Cash and cash equivalents				$ 6.7	$ 10.8	$ 73.2
Restricted cash included in other current assets				5.2	5.2	5.2
Total cash and cash equivalents and restricted cash	$ 16.0	$ 16.0	$ 64.1	$ 11.9	$ 16.0	$ 78.4