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Derivative Instruments (Narrative) (Details) In Millions, except Share data, unless otherwise specified			12 Months Ended						0 Months Ended		12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2013 UPC Holding Cross Currency Options [Member]	Dec. 31, 2013 Virgin Media Capped Call [Member]	Dec. 31, 2013 Sumitomo Collar Loan [Member] installment	Jun. 28, 2007 Sumitomo Collar Loan [Member] USD ($)	Jun. 28, 2007 Sumitomo Collar Loan [Member] JPY (¥)	Dec. 31, 2013 Sumitomo Collar Equity [Member] USD ($)	Dec. 31, 2013 Sumitomo Collar Equity [Member] JPY (¥)	Jul. 25, 2013 Liberty Global Limited [Member] Ziggo Collar [Member] USD ($)	Jul. 25, 2013 Liberty Global Limited [Member] Ziggo Collar [Member] EUR (€)	Dec. 31, 2013 Equity-related derivative instruments [Member] USD ($)	Jul. 31, 2013 Put Options Purchased [Member] Liberty Global Limited [Member] Ziggo Collar [Member] EUR (€)	Jun. 07, 2013 Put Options Purchased [Member] Liberty Global Limited [Member] Ziggo Collar [Member] USD ($)	Jul. 25, 2013 Put Options Purchased [Member] Ziggo N.V. [Member] Ziggo Collar [Member]	Dec. 31, 2013 Ziggo N.V. [Member]	Dec. 31, 2013 Ziggo N.V. [Member] Securities Subject to Re-Use Rights [Member]	Dec. 31, 2013 Ziggo N.V. [Member] Shares Borrowed as Hedge [Member]	Jan. 31, 2014 Subsequent Event [Member] Put Options Purchased [Member] Ziggo N.V. [Member] Ziggo Collar [Member]
Derivative [Line Items]
Fair value derivative assets, counterparty credit risk exposure	$ 578.6
Derivative exchange rate		0.7354
Derivative floor price (in yen/dollars per share)							$ 20.13	¥ 2,118.50
Derivative cap price (in yen/dollars per share)							$ 26.48	¥ 2,787.50
Market price of common stock (in yen/dollars per share)							$ 12.55	¥ 1,321.00
Sumitomo Collar number of equal semi-annual installment maturity dates beginning with initial maturity date of May 22, 2016				5
Sumitomo Collar fair value							381.4
Percentage of Sumitomo shares pledged as collateral on the Sumitomo Collar Loan				100.00%
Stated interest rate of debt				1.883%
Principal amount outstanding	42,691.7				757.6	93,660.0
Percentage of notional amount settled			93.80%
Proceeds from settlement of derivative instrument											534.8
Net option contract premium paid												38.6	51.0
Number of options														24,957,000				19,965,600
Number of common stock shares owned															57,000,738	22,900,000	18,700,000
Borrowed funds									816.4	617.1
Restricted cash									$ 643.5	€ 486.4
Discount rate									0.00%	0.00%
Implied yield									0.45%	0.45%