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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES - Gain on Sale of Subsidiary (Details) R in Millions, $ in Millions |  | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | ---
Mar. 06, 2025 USD ($) | Mar. 06, 2025 ZAR (R) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 ZAR (R) | Mar. 06, 2025 ZAR (R)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Taxes |  |  | $ 131.3 | $ 77.4 | $ 250.2 | $ 168.7 |  |
Disposal Group, Disposed of by Sale, Not Discontinued Operations | South Africa Fiber |  |  |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |  |  |
Proceeds received at closing | $ 137.7 |  |  |  |  |  |  | R 2,500.0
Net assets at closing | (84.1) |  |  |  |  |  |  |
Total gain on sale included in Other operating expenses | 53.6 |  |  |  | 53.6 |  |  |
Taxes | $ 20.8 | R 377.9 |  |  |  |  |  |
Taxes payable |  |  | $ 7.4 |  | $ 7.4 |  | R 131.5 |

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