Fair Value Measurements (Assets and Liabilities Reconciliation) (Schedule and Footnote) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2013
Fair Value, Assets and Liabilities (Net) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance of asset (liability)	$ 941.2
Additions	617.8
Cash settlements of Virgin Media Capped Calls	(534.8)
Losses included in loss from continuing operations:
Realized and unrealized losses on derivative instruments, net	(362.3)
Realized and unrealized loss due to changes in fair values of certain investments, net	(52.0)
Foreign currency translation adjustments, dividends and other, net	38.9
Reclassification of the Chellomedia Disposal Group to discontinued operations	(35.9)
Ending balance of asset (liability)	612.9
Investments [Member]
Fair Value, Assets and Liabilities (Net) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance of asset (liability)	368.2
Additions	0
Cash settlements of Virgin Media Capped Calls	0
Losses included in loss from continuing operations:
Realized and unrealized losses on derivative instruments, net	0
Realized and unrealized loss due to changes in fair values of certain investments, net	(52.0)
Foreign currency translation adjustments, dividends and other, net	19.1
Reclassification of the Chellomedia Disposal Group to discontinued operations	(35.9)
Ending balance of asset (liability)	299.4
Equity-related derivative instruments [Member]
Fair Value, Assets and Liabilities (Net) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Beginning balance of asset (liability)	573.0
Additions	617.8
Cash settlements of Virgin Media Capped Calls	(534.8)
Losses included in loss from continuing operations:
Realized and unrealized loss due to changes in fair values of certain investments, net	0
Foreign currency translation adjustments, dividends and other, net	19.8
Reclassification of the Chellomedia Disposal Group to discontinued operations	0
Ending balance of asset (liability)	$ 313.5

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Additions

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Derivative Instrument Gain (Loss) Included in Earnings

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No definition available.

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Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Gain (Loss) Included in Earnings

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Reclassification to Discontinued Operations

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- Definition

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Settlement

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- Definition

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset Liability Foreign Currency Translation Adjustments

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- Definition

This element represents assets and liabilities, net, measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

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No definition available.

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