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Commitments and Contingencies (Narrative) (Details) € in Millions, £ in Millions | 1 Months Ended | 3 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Oct. 31, 2019 USD ($) | Oct. 31, 2019 EUR (€) | Dec. 31, 2015 USD ($) | Dec. 31, 2015 EUR (€) | Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Mar. 31, 2021 GBP (£) | Oct. 31, 2019 EUR (€) | Aug. 01, 2018
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Programming costs |  |  |  |  | $ 499,700,000 | $ 468,200,000 |  |  |
Percent of customers |  |  |  |  | 50.00% |  |  |  |
Percent of reduction in monthly wholesale cable resale access prices |  |  |  |  |  |  |  |  | 11.50%
Virgin Media VAT Matters |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Estimate of possible loss |  |  |  |  | $ 54,000,000.0 |  | £ 41.3 |  |
Belgium Regulatory Developments |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Percent of reduction in monthly wholesale cable resale access prices |  |  |  |  |  |  |  |  | 17.00%
Interkabel Acquisition |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Damages sought |  |  | $ 1,600,000,000 | € 1,400.0 |  |  |  |  |
Loss contingency accrual |  |  |  |  | $ 0 |  |  |  |
Deutsche Telekom Litigation |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Reduction of annual lease fees |  |  |  |  | 83.33% |  |  |  |
Discontinued Operations, Disposed of by Sale | UPC Austria [Member] |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Asserted claims | $ 82,800,000 | € 70.5 |  |  |  |  |  |  |
Amount of claim | $ 124,800,000 |  |  |  |  |  |  | € 106.2 |

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