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Derivative Instruments (Net Cash Received (Paid) Related to Derivatives) (Schedule) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Operating activities	$ (135.5)	$ 41.3
Financing activities	(7.1)	9.8
Total	$ (142.6)	$ 51.1

X

- Definition

Payments for (Proceeds from) Derivative Instrument, Operating Activities

+ References

No definition available.

+ Details

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X

- Definition

Payments For Proceeds From Derivatives Continuing Operations

+ References

No definition available.

+ Details

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Namespace Prefix:	lbtya_
Data Type:	xbrli:monetaryItemType
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X

- References

No definition available.

+ Details

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X

- Definition

The net cash outflow or inflow from derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690

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