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Fair Value Of Financial Instruments (Schedule Of Key Valuation Inputs Used To Measure Fair Value Of Investment In Cell C) (Details) - Cell C [Member] R in Millions, $ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 USD ($) | Jun. 30, 2020 | Dec. 31, 2020 ZAR (R) | Jun. 30, 2019 USD ($) | Jun. 30, 2019 ZAR (R)
Net adjusted external debt | $ 800.0 |  | R 11,200 | $ 900.0 | R 15,800
Lease liabilities included in net adjusted external debt |  |  | 0 |  | 4,400
Deferred tax including assessed tax losses | $ 0.0 |  | R 0 | $ 167.3 | R 2,900
Weighted Average Cost of Capital (WACC) Rate [Member] | Minimum [Member] |  |  |  |  |
Investment fair value measurement inputs | 17.00% | 17.00% |  |  |
Weighted Average Cost of Capital (WACC) Rate [Member] | Maximum [Member] |  |  |  |  |
Investment fair value measurement inputs | 22.00% | 22.00% |  |  |
Long Term Growth Rate [Member] |  |  |  |  |
Investment fair value measurement inputs | 3.00% | 3.00% |  |  |
Marketability Discount [Member] |  |  |  |  |
Investment fair value measurement inputs | 10.00% |  |  |  |
Minority Discount [Member] |  |  |  |  |
Investment fair value measurement inputs | 15.00% |  |  |  |

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