Acquisitions and Discontinued Operation (Disposal Group) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenue	$ 94.7	$ 26.6	$ 294.6
Chellomedia [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating income (loss)	0.7	0.6	(2.0)
Earnings (loss) before income taxes and noncontrolling interests	(5.2)	0.9	(4.8)
Income tax expense	(5.6)	(0.1)	(8.4)
Earnings (loss) from discontinued operation attributable to Liberty Global shareholders, net of taxes	$ (11.6)	$ 0.8	$ (14.3)