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Contingent Liabilities and Other Matters - Large Power Projects in South Africa (Details) R in Millions |  |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 16, 2020 ZAR (R) | Jan. 16, 2020 USD ($) | Oct. 30, 2018 ZAR (R) | Oct. 30, 2018 USD ($) | Dec. 31, 2019 USD ($) | Sep. 28, 2019 USD ($) | Jun. 29, 2019 USD ($) | Mar. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 29, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Jul. 01, 2017 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 ZAR (R) project | Dec. 31, 2019 USD ($) project | Jul. 31, 2019 ZAR (R) | Jul. 31, 2019 USD ($) | Feb. 26, 2019 ZAR (R) | Feb. 26, 2019 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of large power projects | project |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2 | 2 |  |  |  |
Revenues |  |  |  |  | $ (444,600,000) | $ (364,800,000) | $ (372,400,000) | $ (343,600,000) | $ (445,000,000.0) | $ (362,500,000) | $ (379,200,000) | $ (351,900,000) |  |  | $ (1,525,400,000) | $ (1,538,600,000) | $ (1,425,800,000) |  |  |  |  |  |
Demand Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 65,100,000 |  |  |  |
Demand Bonds Stringent Payment Requirements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 23,300,000 |  |  |  |
South Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,100,000 | (72,700,000) | (56,900,000) |  |  |  |  |  |
Large Power Projects | South Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecorded gain contingency |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | R 1,133.3 | 80,800,000 |  |  |  |
Estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,600,000 |  |  | R 948.0 | $ 67,600,000
Reportable and other operating segments | Large Power Projects | Revisions in estimates for large power projects | South Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |
All Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,600,000 | (98,600,000) | (93,800,000) |  |  |  |  |  |
All Other | Reportable and other operating segments | Large Power Projects | Revisions in estimates for large power projects | South Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  | $ 6,000,000.0 | $ 17,500,000 |  |  |  |  | $ 23,400,000 | $ 13,500,000 | $ 23,500,000 | $ 2,700,000 | $ 36,900,000 |  |  |  |  |  |
MHPSA April And July 2019 Claims | Large Power Projects | South Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | R 407.2 | $ 29,000,000.0 |  |
MHPSA Additional Claims | Large Power Projects | South Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss | R |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | R 176.2 |  |  |  |  |
DBT Technologies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement awarded to other party |  |  | R 256.0 | $ 18,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
DBT Technologies | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement awarded to other party | R 19.4 | $ 1,400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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