v3.10.0.1

Income Taxes (Narrative) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 01, 2020 | Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |  |  |
Change in valuation allowances |  |  |  |  |  | $ (150.0) |  |
Deferred tax liability, temporary difference |  |  |  |  |  | 5,900.0 |  |
Recorded liability for the Mandatory Repatriation Tax |  |  |  |  |  | 293.3 |  |
Unrecognized tax benefits - favorable impact on effective income tax rate if ultimately recognized, net of valuation allowances |  |  |  |  |  | 759.8 |  |
Reductions to our unrecognized tax benefits reasonably possible |  |  |  |  |  | 225.0 |  |
Income tax penalties and interest expense |  |  |  |  |  | (58.9) | $ (5.5) | $ 30.9
Accrued interest and penalties on tax related items |  |  |  |  |  | 94.0 |  |
Other Deferred Tax Asset [Member] |  |  |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |  |  |
Change in valuation allowances |  |  |  |  |  | 34.9 |  |
Virgin Media |  |  |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |  |  |
Amount on which future tax deductions can be claimed |  |  | $ 19,400.0 |  |  | $ 18,100.0 | $ 19,400.0 |
Maximum percent of capital allowances claimed allowance |  |  |  |  |  | 18.00% |  |
Domestic Tax Authority [Member] |  |  |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |  |  |
Statutory income tax rate |  | 20.00% | 19.00% |  |  | 19.00% | 19.25% | 20.00%
Domestic Tax Authority [Member] | Scenario, Forecast |  |  |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |  |  |
Statutory income tax rate | 17.00% |  |  |  |  |  |  |
The Netherlands |  |  |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |  |  |
Statutory income tax rate |  |  |  |  |  | 25.00% |  |
The Netherlands | Scenario, Forecast |  |  |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |  |  |
Statutory income tax rate |  |  |  | 20.50% | 22.50% |  |  |
Belgium |  |  |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |  |  |
Statutory income tax rate |  |  |  |  |  | 29.58% | 33.90% |
Belgium | Scenario, Forecast |  |  |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |  |  |
Statutory income tax rate |  |  |  |  | 25.00% |  |  |
U.S. |  |  |  |  |  |  |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |  |  |  |  |  |  |
Statutory income tax rate |  |  |  |  |  | 21.00% | 35.00% |

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