Dutch JV Transaction and Discontinued Operation (Schedules) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2016
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Ziggo Group Holding [Member]
Assets:
Cash and cash equivalents		$ 6.1
Current restricted cash		3,144.0
Current assets other than cash		259.0
Property and equipment, net		3,201.2
Goodwill		7,637.2
Intangible assets subject to amortization, net		3,406.7
Other assets, net		578.8
Total assets		18,233.0
Liabilities:
Current portion of debt and capital lease obligations		290.3
Other accrued and current liabilities		2,396.4
Long-term debt and capital lease obligations		11,812.8
Other long-term liabilities		991.7
Total liabilities		$ 15,491.2
Discontinued Operations, Disposed of by Sale [Member] | Chellomedia [Member]
Disposal Group, Not Discontinued Operation, Income Statement Disclosures [Abstract]
Revenue	$ 26.6
Operating income	0.6
Earnings before income taxes and noncontrolling interests	0.9
Income tax expense	(0.1)
Earnings from discontinued operation attributable to Liberty Global shareholders, net of taxes	$ 0.8