Income Taxes (Table 4) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets:
Net operating loss and other carryforwards	$ 6,637.9	$ 7,286.1
Property and equipment, net	3,469.2	3,470.7
Debt	1,189.0lbtya_DeferredTaxAssetsDebt	837.7lbtya_DeferredTaxAssetsDebt
Derivative instruments	345.9	518.4
Intangible assets	149.6lbtya_DeferredTaxAssetsIntangibleAssets	187.5lbtya_DeferredTaxAssetsIntangibleAssets
Other future deductible amounts	265.3us-gaap_DeferredTaxAssetsOther	265.0us-gaap_DeferredTaxAssetsOther
Deferred tax assets	12,056.9us-gaap_DeferredTaxAssetsGross	12,565.4us-gaap_DeferredTaxAssetsGross
Valuation allowance	(6,679.4)	(7,052.8)
Deferred tax assets, net of valuation allowance	5,377.5us-gaap_DeferredTaxAssetsNet	5,512.6us-gaap_DeferredTaxAssetsNet
Deferred tax liabilities:
Intangible assets	(2,338.2)	(1,471.1)
Property and equipment, net	(1,861.4)	(1,945.3)
Investments	(367.6)	(400.7)
Derivative instruments	(142.7)	(129.5)
Other future taxable amounts	(160.3)us-gaap_DeferredTaxLiabilitiesOther	(253.8)us-gaap_DeferredTaxLiabilitiesOther
Deferred tax liabilities	(4,870.2)us-gaap_DeferredTaxLiabilities	(4,200.4)us-gaap_DeferredTaxLiabilities
Net deferred tax asset	$ 507.3us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 1,312.2us-gaap_DeferredTaxAssetsLiabilitiesNet

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