SCHEDULE I (Parent Company Information) CONDENSED STATEMENT OF CASH FLOWS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			7 Months Ended	5 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Jun. 07, 2013
Cash flows from operating activities:
Net earnings (loss)	$ (695.0)	$ (963.9)	$ 322.8
Adjustments to reconcile loss from continuing operations to net cash provided by operating activities:
Share-based compensation expense	257.2	300.7	110.1
Depreciation and amortization	5,500.1	4,276.4	2,661.5
Realized and unrealized losses (gains) on derivative instruments, net	(88.8)	1,020.4	1,070.3
Foreign currency transaction losses (gains), net	836.5	(349.3)	(438.4)
Deferred income tax expense (benefit)	(350.6)	18.6	36.0
Excess tax benefits from share-based compensation	(7.0)	(41.0)	(6.7)
Changes in operating assets and liabilities:
Receivables and other operating assets	860.5	866.7	785.0
Payables and accruals	(1,017.8)	(1,208.1)	(1,171.7)
Net cash provided by (used by) operating activities	5,603.2	3,931.3	2,919.7
Cash flows from investing activities:
Capital expenditures	(2,684.4)	(2,481.5)	(1,868.3)
Other investing activities, net	(13.8)	(44.9)	41.8
Net cash provided by (used by) investing activities	(2,803.4)	(7,965.0)	(1,080.9)
Cash flows from financing activities:
Repurchase of Liberty Global and LGI shares	(1,584.9)	(1,157.2)	(970.3)
Other financing activities, net	0.4	137.6	(139.9)
Net cash provided (used) by financing activities	(4,261.3)	4,615.9	(1,469.8)
Effect of exchange rate changes on cash	(81.9)	85.4	18.7
Net increase (decrease) in cash and cash equivalents	(1,543.4)	667.6	387.7
Cash and cash equivalents:
Beginning of year	2,701.9	2,038.9	1,651.2		2,038.9
End of year	1,158.5	2,701.9	2,038.9	2,701.9
Liberty Global [Member]
Cash flows from operating activities:
Net earnings (loss)	(695.0)	(963.9)	322.8	(1,012.9)
Adjustments to reconcile loss from continuing operations to net cash provided by operating activities:
Equity in earnings of consolidated subsidiaries, net	1,120.8			1,306.3
Share-based compensation expense	20.2			3.5
Related-party fees and allocations	151.8			54.9
Other operating charges	3.5			0
Realized and unrealized losses (gains) on derivative instruments, net	(13.7)			4.5
Foreign currency transaction losses (gains), net	58.2			0
Deferred income tax expense (benefit)	(3.6)			(0.4)
Changes in operating assets and liabilities:
Receivables and other operating assets	0.2			(104.9)
Payables and accruals	(65.3)			2.6
Net cash provided by (used by) operating activities	577.1			253.6
Cash flows from investing activities:
Distributions and advances from subsidiaries and affiliates, net	(368.3)			949.0
Other investing activities, net	1.8			(11.3)
Net cash provided by (used by) investing activities	(366.5)			937.7
Cash flows from financing activities:
Repurchase of Liberty Global and LGI shares	(1,584.9)			(971.8)
Borrowings of related-party debt	1,221.5			0
Repayments of related-party debt	(542.3)			0
Proceeds received from subsidiaries in connection with the issuance of Liberty Global shares	435.1			0
Proceeds (payments) associated with call option contracts, net	(41.7)			4.1
Proceeds from issuance of LGI common stock upon exercise of stock options	54.8			78.1
Other financing activities, net	(6.6)			(11.0)
Net cash provided (used) by financing activities	(464.1)			(900.6)
Effect of exchange rate changes on cash	(0.5)			0
Net increase (decrease) in cash and cash equivalents	(254.0)			290.7
Cash and cash equivalents:
Beginning of year	290.7			0
End of year	36.7	290.7		290.7
Liberty Global plc [Member]
Cash flows from operating activities:
Net earnings (loss)			322.8	(1,012.9)	49.0
Adjustments to reconcile loss from continuing operations to net cash provided by operating activities:
Equity in earnings of consolidated subsidiaries, net			(390.7)	1,306.3	(120.0)
Share-based compensation expense			33.0		11.5
Depreciation and amortization			0.8		0.3
Other operating charges			0		48.1
Realized and unrealized losses (gains) on derivative instruments, net				4.5
Foreign currency transaction losses (gains), net				0
Deferred income tax expense (benefit)			111.7		(21.9)
Excess tax benefits from share-based compensation			(2.6)		0
Changes in operating assets and liabilities:
Receivables and other operating assets			(27.1)		(7.2)
Payables and accruals			(71.4)		(23.8)
Net cash provided by (used by) operating activities			(23.5)		(64.0)
Cash flows from investing activities:
Distributions and advances from subsidiaries and affiliates, net			855.1		163.1
Capital expenditures			(2.0)		(0.7)
Net cash provided by (used by) investing activities			853.1		162.4
Cash flows from financing activities:
Repurchase of Liberty Global and LGI shares			(970.3)		(185.4)
Proceeds (payments) associated with call option contracts, net			(52.1)		55.5
Proceeds from issuance of LGI common stock upon exercise of stock options			25.6		2.9
Payment of net settled employee withholding taxes on share-based incentive awards			(22.1)		(13.1)
Excess tax benefits from share-based compensation			2.6		0
Net cash provided (used) by financing activities			(1,016.3)		(140.1)
Net increase (decrease) in cash and cash equivalents			(186.7)		(41.7)
Cash and cash equivalents:
Beginning of year		69.4	256.1	27.7	69.4
End of year		$ 69.4	$ 69.4	$ 69.4	$ 27.7