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Contingent Liabilities and Other Matters - Large Power Projects in South Africa (Details) R in Millions |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
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 project | Jul. 23, 2020 ZAR (R) | May 31, 2021 USD ($) | May 31, 2021 ZAR (R) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 ZAR (R) | Dec. 31, 2022 USD ($) project | Dec. 31, 2022 ZAR (R) | Dec. 31, 2022 ZAR (R) project | Oct. 14, 2022 USD ($) | Oct. 14, 2022 ZAR (R) | Oct. 11, 2022 USD ($) | Oct. 11, 2022 ZAR (R) | Sep. 21, 2022 USD ($) | Sep. 21, 2022 ZAR (R) | Dec. 31, 2021 USD ($) | Jun. 04, 2021 USD ($) | Jun. 04, 2021 ZAR (R) | Jul. 31, 2019 USD ($) | Jul. 31, 2019 ZAR (R)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of large power projects | project |  |  |  |  |  |  |  |  |  |  |  | 2 |  | 2 |  |  |  |  |  |  |  |  |  |  |
Number of disputes | dispute |  |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  |  |  | $ 197,400,000 |  |  |  |  |  |  |  |  | $ 675,900,000 |  |  |  |
Large power projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecorded gain contingency |  |  |  |  |  |  |  |  |  |  |  | 58,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecorded gain contingency, current procceding |  |  |  |  |  |  |  |  |  |  |  | 42,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for bonds |  |  |  |  | $ 6,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Africa | Large power projects |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecorded gain contingency | R |  |  |  |  |  |  |  |  |  |  |  |  |  | R 1,000.0 |  |  |  |  |  |  |  |  |  |  |
Unrecorded gain contingency, current procceding | R |  |  |  |  |  |  |  |  |  |  |  |  |  | 732.6 |  |  |  |  |  |  |  |  |  |  |
Number of disputes | project |  |  | 2 | 2 |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded | $ 6,000,000.0 | R 82.0 | $ 8,600,000 | R 126.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 20,400,000 | R 349.6 |  | $ 46,100,000 | R 790.0 |  |
South Africa | Large power projects | MHI April And July 2019 Claims |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23,800,000 | R 407.2
South Africa | Large power projects | MHI Additional Claims |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,300,000 | R 176.2
South Africa | Large power projects | Demand Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
South Africa | Large power projects | Demand Bonds | MHI |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded |  |  |  |  |  | 1,100,000 | R 18.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  | 29.2 |  |  |  |  |  |  |  |  |  |  |
Payment for bonds |  |  |  |  |  |  |  | $ 12,500,000 | R 178.7 | $ 14,300,000 | R 239.6 | 24,400,000 | R 418.3 |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  |  |  | $ 19,100,000 |  | R 327.5 | $ 700,000 | R 12.5 | $ 5,000,000.0 | R 90.8 |  |  |  |  |  |  |
South Africa | Large power projects | Demand Bonds | Bonds Upon Completion Of Certain Administrative Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  | $ 4,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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