Discontinued Operations (Balance Sheet and Income Statement Summary) (Schedules) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets:
Cash and cash equivalents	$ 0	$ 4.6	$ 0
Chellomedia [Member]
Assets:
Investments	0	21.1
Discontinued operations [Member]
Disposal Group, Not Discontinued Operation, Income Statement Disclosures [Abstract]
Income tax expense	0.1	22.7	28.1
Discontinued operations [Member] \| Chellomedia [Member]
Assets:
Cash and cash equivalents		4.6
Other current assets		234.1
Investments		21.1
Property and equipment, net		43.1
Goodwill		224.4
Other assets		225.0
Total assets		752.3
Liabilities:
Current liabilities		127.5
Other long-term liabilities		19.8
Total liabilities		147.3
Total equity		605.0
Total liabilities and equity		752.3
Discontinued operations [Member] \| Chellomedia and Austar [Member]
Disposal Group, Not Discontinued Operation, Income Statement Disclosures [Abstract]
Revenue	26.6	408.6	673.7
Operating income	0.6	12.1	78.7
Earnings (loss) before income taxes and noncontrolling interests	0.9	(1.0)	75.2
Income tax expense	(0.1)	(22.7)	(28.1)
Earnings (loss) from discontinued operations attributable to Liberty Global shareholders, net of taxes	$ 0.8	$ (26.3)	$ 22.4

Disposal Group Including Discontinued Operation Current Liabilities

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Disposal Group Including Discontinued Operation Investments

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Disposal Group Including Discontinued Operation Liabilities and Stockholders Equity

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Disposal Group Including Discontinued Operation Stockholders Equity

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This element represents the overall income (loss) from a disposal group that is classified as a component of the entity, net of income tax, reported as a separate component of income before extraordinary items after deducting the amount which is allocable to noncontrolling interests, if any. Includes the following (net of tax): income (loss) from operations during the phase

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The aggregate value (measured at the lower of net carrying value or fair value less cost of disposal) for assets of a disposal group, including a component of the entity (discontinued operation), to be sold or that has been disposed of through sale, as of the financial statement date.

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Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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For the disposal group, including a component of the entity (discontinued operation), cash includes currency on hand as well as demand deposits with banks or financial institutions. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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For the disposal group, including a component of the entity (discontinued operation), carrying amount of goodwill (adjusted for any amortization recognized prior to adoption of FAS 142 and impairment charges).

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Amount of operating income or loss attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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For the disposal group, including a component of the entity (discontinued operation), carrying amount of assets not otherwise specified in the taxonomy that are expected to be realized or consumed within one year or the normal operating cycle, if longer.

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For the disposal group, including a component of the entity (discontinued operation), obligations not otherwise itemized.

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For the disposal group, including a component of the entity (discontinued operation), carrying amount as of the balance sheet date of assets not otherwise specified, and which are expected to be realized or consumed after one year or beyond the normal operating cycle, if longer. For an unclassified balance sheet, represents both current and noncurrent other assets.

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For the disposal group, including a component of the entity (discontinued operation), carrying value (net of accumulated depreciation and any write-downs) of tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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Amount of sales or other form of revenues attributable to the disposal group, including a component of the entity (discontinued operation), during the reporting period.

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The obligations arising from the sale, disposal, or planned sale in the near future (generally within one year) of a disposal group, including a component of the entity (discontinued operation).

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