Investments (Schedule of Investments by Accounting Method) (Details) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Investment [Line Items]
Fair value	$ 1,662.7us-gaap_InvestmentsFairValueDisclosure	$ 3,481.8us-gaap_InvestmentsFairValueDisclosure
Equity	145.1us-gaap_EquityMethodInvestments	8.9us-gaap_EquityMethodInvestments
Cost	0.4us-gaap_CostMethodInvestments	0.5us-gaap_CostMethodInvestments
Total	1,808.2us-gaap_LongTermInvestments	3,491.2us-gaap_LongTermInvestments
Discontinued operation — Investments held by the Chellomedia Disposal Group
Investment [Line Items]
Discontinued operation — Investments held by the Chellomedia Disposal Group	0	21.1
Ziggo [Member]
Investment [Line Items]
Fair value	0	2,609.5
Number of common stock shares owned (in shares)		57,000,738
Ziggo [Member] \| Securities Not Subject to Re-Use Rights [Member]
Investment [Line Items]
Fair value	0	1,560.1
Number of common stock shares owned (in shares)		34,100,000
Ziggo [Member] \| Securities Subject to Re-Use Rights [Member]
Investment [Line Items]
Fair value	0	1,049.4
Number of common stock shares owned (in shares)		22,900,000
ITV - Subject to Re-Use Rights [Member]
Investment [Line Items]
Fair value	871.2	0
Sumitomo [Member]
Investment [Line Items]
Fair value	473.1	572.9
Number of common stock shares owned (in shares)	45,652,043	45,652,043
ITI Neovision S.A. (ITI Neovision) (formerly Canal Cyfrowy S.A.) [Member]
Investment [Line Items]
Fair value	$ 318.4	$ 299.4

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