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CONTINGENT LIABILITIES AND OTHER MATTERS - Large Power Projects in South Africa (Details) R in Millions |  |  |  |  |  | 1 Months Ended |  |  |  |
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Oct. 02, 2021 USD ($) | Oct. 02, 2021 ZAR (R) | Apr. 28, 2021 USD ($) | Apr. 28, 2021 ZAR (R) | Feb. 22, 2021 USD ($) project | Feb. 22, 2021 ZAR (R) project | Feb. 05, 2021 USD ($) | Jul. 23, 2020 USD ($) dispute | Jul. 23, 2020 ZAR (R) | May 31, 2021 USD ($) | May 31, 2021 ZAR (R) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 ZAR (R) | Oct. 02, 2021 ZAR (R) | Jun. 04, 2021 USD ($) | Jun. 04, 2021 ZAR (R) | Dec. 31, 2020 USD ($) | Dec. 31, 2020 ZAR (R) | Jul. 31, 2019 USD ($) | Jul. 31, 2019 ZAR (R)
Contingent Liabilities and Other Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of disputes | dispute |  |  |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |
Other assets | $ 590,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 609,800,000 |  |  |
Large Power Projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Liabilities and Other Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for bonds |  |  |  |  |  |  | $ 6,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |
SOUTH AFRICA | Large Power Projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Liabilities and Other Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain contingency | 72,500,000 |  |  |  |  |  |  |  |  |  |  |  |  | R 1,100.0 |  |  |  |  |  |
Unrecorded gain contingency, current proceeding | 37,400,000 |  |  |  |  |  |  |  |  |  |  |  |  | 566.5 |  |  |  |  |  |
Number of disputes | project |  |  |  |  | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement |  |  | $ 6,000,000.0 | R 82.0 | $ 8,600,000 | R 126.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible legal claim deemed unlikely |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 62,600,000 | R 950.0 |  |  |  |
SOUTH AFRICA | Large Power Projects | Demand Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Liabilities and Other Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Original loan balance |  |  |  |  |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |
SOUTH AFRICA | Large Power Projects | Demand Bonds | MHI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Liabilities and Other Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement |  |  |  |  |  |  |  | 1,100,000 | R 18.4 |  |  |  |  |  |  |  |  |  |  |
Estimate of possible legal claim deemed unlikely | 1,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for bonds | 27,600,000 | R 418.3 |  |  |  |  |  |  |  | $ 12,500,000 | R 178.7 | $ 14,300,000 | R 239.6 |  |  |  |  |  |  |
Other assets | $ 27,600,000 |  |  |  |  |  |  |  |  |  |  |  |  | R 418.3 |  |  | $ 27,600,000 | R 418.3 |  |
SOUTH AFRICA | Large Power Projects | Demand Bonds | Bonds Upon Completion Of Certain Administrative Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Liabilities and Other Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Original loan balance |  |  |  |  |  |  |  | $ 4,500,000 |  |  |  |  |  |  |  |  |  |  |  |
SOUTH AFRICA | Large Power Projects | MHI April And July 2019 Claims |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Liabilities and Other Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible legal claim deemed unlikely |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,900,000 | R 407.2
SOUTH AFRICA | Large Power Projects | MHI Additional Claims |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent Liabilities and Other Matters |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible legal claim deemed unlikely |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 11,600,000 | R 176.2

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