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Debt (Footnotes) (Details) € in Millions, $ in Millions | Apr. 01, 2021 EUR (€) | Apr. 01, 2021 USD ($) | Mar. 31, 2021 EUR (€) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  |  | 3.27% | 3.27% |
Unused borrowing capacity |  |  |  | $ 1,494.1 |
Long-term Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Estimated fair value |  |  |  | $ 14,000.0 | $ 14,700.0
Aggregate Variable and Fixed Rate Indebtedness |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Weighted average interest rate |  |  | 3.67% | 3.67% |
Telenet Revolving Credit Facility I |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused borrowing capacity |  |  | € 510.0 | $ 599.2 |
Telenet Overdraft Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused borrowing capacity |  |  | 25.0 | 29.4 |
Telenet Revolving Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused borrowing capacity |  |  | 20.0 | 23.5 |
UPC Revolving Facility One |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused borrowing capacity |  |  | 500.0 | 587.5 |
UPC Revolving Facility |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused borrowing capacity |  |  | € 216.6 | $ 254.5 |
UPC Revolving Facility | Subsequent Event |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Unused borrowing capacity | € 736.4 | $ 865.2 |  |  |

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