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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Change in valuation allowances | $ 140.8 |  |
Change in valuation allowances | 113.6 | $ 34.9 | $ 341.6
Recorded liability for the Mandatory Repatriation Tax | 357.2 | 293.3 |
Unrecognized tax benefits - favorable impact on effective income tax rate if ultimately recognized, net of valuation allowances | 546.5 | 759.8 | 189.3
Reductions to our unrecognized tax benefits reasonably possible | 285.0 |  |
Income tax penalties and interest expense | 22.6 | 58.9 | $ 5.5
Accrued interest and penalties on tax related items | 115.1 |  |
Virgin Media |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |
Amount on which future tax deductions can be claimed | $ 18,400.0 | $ 18,100.0 |
Maximum percent of capital allowances claimed allowance | 18.00% |  |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of reasonable estimate for tax liability for which accounting for tax effect from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated is incomplete pursuant to Tax Cuts and Jobs Act. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2A -Subparagraph (SAB Topic 5.EE.Q2(b)) -URI http://asc.fasb.org/extlink&oid=116825942&loc=SL116722634-122817 + Details
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