v3.3.1.900

Income Taxes (Narrative) (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2014 | Apr. 30, 2015 | Apr. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |
Change in valuation allowances |  |  |  | $ 373.4 |  |
Net operating losses from deductions of stock based compensation excluded from recorded deferred tax assets |  |  |  | 141.7 |  |
Deferred tax liability, temporary difference |  |  |  | 11,100.0 |  |
Unrecognized tax benefits - favorable impact on effective income tax rate if ultimately recognized, net of valuation allowances |  |  |  | 332.9 |  |
Reasonably possible resolution of ongoing income tax examinations, reduction to unrecognized tax benefits, upper bound |  |  |  | 230.0 |  |
Accrued interest and penalties on tax related items |  |  |  | 51.7 |  |
Virgin Media [Member] |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |
Amount on which future tax deductions can be claimed |  |  |  | $ 21,600.0 | $ 22,200.0 |
Maximum percent of capital allowances claimed allowance |  |  |  | 18.00% |  |
Continuing operations [Member] |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |
Change in valuation allowances related to net tax expense |  |  |  | $ (361.2) |  |
Benefit (expense) from release (accrual) of interest and penalties |  |  |  | $ (10.9) | $ (14.0) | $ (7.7)
Domestic Tax Authority [Member] |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |
Statutory income tax rate | 23.00% |  | 21.00% |  |  |
Domestic Tax Authority [Member] | Scenario, Forecast [Member] |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |
Statutory income tax rate |  | 20.00% |  |  |  |
Foreign Tax Authority [Member] |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |
Statutory income tax rate |  |  |  | 35.00% |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
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