SCHEDULE I (Parent Company Information) CONDENSED STATEMENT OF OPERATIONS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended			7 Months Ended	5 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Jun. 07, 2013
Operating costs and expenses:
Selling, general and administrative (including stock-based compensation)									$ 3,172.8	$ 2,616.5	$ 1,860.3
Depreciation and amortization									5,500.1	4,276.4	2,661.5
Other operating charges									6,810.4	5,417.7	3,349.7
Operating income	273.3	703.7	669.5	581.7	517.6	521.2	445.1	528.2	2,228.2	2,012.1	1,983.1
Non-operating income (expense):
Realized and unrealized gains (losses) on derivative instruments, net (note 7)									88.8	(1,020.4)	(1,070.3)
Foreign currency transaction gains (losses), net									(836.5)	349.3	438.4
Other expense, net									(42.4)	(5.6)	(4.6)
Non-operating income (expense)									(3,284.1)	(2,538.6)	(2,492.0)
Income tax expense (benefit)									75.0	(355.5)	(75.0)
Net earnings (loss) attributable to Liberty Global shareholders	(523.4)	157.1	(249.9)	(78.8)	(121.2)	(830.1)	(11.6)	(1.0)	(695.0)	(963.9)	322.8
Liberty Global [Member]
Operating costs and expenses:
Selling, general and administrative (including stock-based compensation)									43.0
Related-party fees and allocations									151.8
Other operating charges									3.5
Operating income									(198.3)
Non-operating income (expense):
Interest income (expense), net									812.1
Realized and unrealized gains (losses) on derivative instruments, net (note 7)									13.7			(4.5)
Foreign currency transaction gains (losses), net									(58.2)			0
Other expense, net									(8.1)
Non-operating income (expense)									759.5
Earnings (loss) before income taxes and equity in earnings (losses) of consolidated subsidiaries, net									561.2
Equity in earnings of consolidated subsidiaries, net									(1,120.8)			(1,306.3)
Income tax expense (benefit)									(135.4)
Net earnings (loss) attributable to Liberty Global shareholders									(695.0)	(963.9)	322.8	(1,012.9)
Liberty Global plc [Member]
Operating costs and expenses:
Selling, general and administrative (including stock-based compensation)											98.1	9.7	43.5
Related-party fees and allocations												54.9
Depreciation and amortization											0.8		0.3
Other operating charges											0	0	48.1
Operating income											(98.9)	(64.6)	(91.9)
Non-operating income (expense):
Interest income (expense), net											(0.1)	468.3	(0.7)
Realized and unrealized gains (losses) on derivative instruments, net (note 7)												(4.5)
Foreign currency transaction gains (losses), net												0
Other expense, net											(0.5)	0	(0.1)
Non-operating income (expense)											(0.6)	463.8	(0.8)
Earnings (loss) before income taxes and equity in earnings (losses) of consolidated subsidiaries, net											(99.5)	399.2	(92.7)
Equity in earnings of consolidated subsidiaries, net											390.7	(1,306.3)	120.0
Income tax expense (benefit)											31.6	(105.8)	21.7
Net earnings (loss) attributable to Liberty Global shareholders											$ 322.8	$ (1,012.9)	$ 49.0