Fair Value Measurements (Narrative) (Details) In Millions, unless otherwise specified	12 Months Ended	0 Months Ended			12 Months Ended	0 Months Ended
	Dec. 31, 2013 USD ($)	Jun. 07, 2013 Virgin Media Capped Call [Member] USD ($)	Dec. 31, 2013 Minimum [Member] Equity Contract [Member]	Dec. 31, 2013 Maximum [Member] Equity Contract [Member]	Dec. 31, 2013 Customer Relationships [Member] Virgin Media Acquisition [Member]	Jul. 25, 2013 Liberty Global Limited [Member] Ziggo Collar [Member]	Jul. 31, 2013 Liberty Global Limited [Member] Ziggo Collar [Member] Put Options Purchased [Member] EUR (€)	Jun. 07, 2013 Liberty Global Limited [Member] Ziggo Collar [Member] Put Options Purchased [Member] USD ($)
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Estimated volatilities			22.00%	36.00%
Discount rate					9.00%	0.00%
Additions	$ 617.8	$ 566.8
Net option contract premium paid							€ 38.6	$ 51.0