Investments (Details) In Millions, except Share data, unless otherwise specified				12 Months Ended											12 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2013 Discontinued operation — Investments held by the Chellomedia Disposal Group USD ($)	Dec. 31, 2013 Ziggo N.V. [Member] USD ($)	Dec. 31, 2013 Ziggo N.V. [Member] EUR (€)	Dec. 31, 2012 Ziggo N.V. [Member] USD ($)	Dec. 31, 2013 Ziggo N.V. [Member] Securities Not Subject to Re-Use Rights [Member] USD ($)	Dec. 31, 2012 Ziggo N.V. [Member] Securities Not Subject to Re-Use Rights [Member] USD ($)	Dec. 31, 2013 Ziggo N.V. [Member] Securities Subject to Re-Use Rights [Member] USD ($)	Dec. 31, 2012 Ziggo N.V. [Member] Securities Subject to Re-Use Rights [Member] USD ($)	Dec. 31, 2013 Sumitomo [Member] USD ($)	Dec. 31, 2012 Sumitomo [Member] USD ($)	Dec. 31, 2013 Cyfra, Privately Held DTH Operator in Poland [Member] USD ($)	Dec. 31, 2012 Cyfra, Privately Held DTH Operator in Poland [Member] USD ($)	Dec. 31, 2013 Ziggo N.V. [Member] USD ($)
Schedule of Investments [Line Items]
Fair value	$ 3,481.8	$ 947.9		$ 2,609.5		$ 0	$ 1,560.1	$ 0	$ 1,049.4	$ 0	$ 572.9	$ 579.7	$ 299.4	$ 368.2
Equity	8.9	1.7
Cost	0.5	0.5
Total	3,491.2	950.1
Discontinued operation — Investments held by the Chellomedia Disposal Group			21.1
Number of common stock shares owned				57,000,738			34,100,000		22,900,000		45,652,043	45,652,043
Percentage of Sumitomo total outstanding common stock shares owned				28.50%							5.00%
Percentage of equity, percentage of shares acquired													17.00%	17.00%
Business Acquisition, Share Price				$ 36.40	€ 26.40
Cost of acquired entity				2,075.3	1,505.0
Share price (in dollar/euro per share)				$ 45.78	€ 33.20
Shares Not Pledged as Collateral				4,743,738
Proceeds from Equity Method Investment, Dividends or Distributions				78.4
Summarized financial condition of Ziggo
Current assets															288.5
Long-term assets															6,336.3
Total assets															6,624.8
Current liabilities															539.3
Long-term liabilities															4,747.2
Owners’ equity															1,338.3
Total liabilities and owners’ equity															6,624.8
Summarized results of operations of Ziggo
Revenue															1,570.7
Operating income															418.5
Net earnings															$ 199.1