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Contingent Liabilities and Other Matters - Large Power Projects in South Africa (Details) R in Millions, $ in Millions |  |  |  |  | 1 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 22, 2021 USD ($) project | Feb. 22, 2021 ZAR (R) project | Dec. 31, 2020 USD ($) project | Dec. 31, 2020 ZAR (R) | Jul. 23, 2020 USD ($) dispute | Jul. 23, 2020 ZAR (R) | Oct. 16, 2019 USD ($) | Oct. 16, 2019 ZAR (R) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 ZAR (R) | Dec. 31, 2020 ZAR (R) project | Sep. 30, 2020 ZAR (R) | Sep. 26, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jul. 31, 2019 USD ($) | Jul. 31, 2019 ZAR (R) | Feb. 26, 2019 USD ($) | Feb. 26, 2019 ZAR (R)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of large power projects | project |  |  | 2 |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |
Number of disputes | dispute |  |  |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  | $ 616.4 |  |  |  |  |  |  |  |  |  |  | $ 605.5 |  |  |  |
South Africa | Subsidiary |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on litigation settlement |  |  |  |  |  |  | $ 1.8 | R 27.0 |  |  |  |  |  |  |  |  |  |
Litigation settlement, tax effect |  |  |  |  |  |  | 3.8 |  |  |  |  |  |  |  |  |  |  |
South Africa | Subsidiary | Put Option |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement awarded to other party |  |  |  |  |  |  | $ 15.6 | 230.0 |  |  |  |  |  |  |  |  |  |
Net redemption value | R |  |  |  |  |  |  |  | R 257.0 |  |  |  |  |  |  |  |  |  |
Large Power Projects | South Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecorded gain contingency |  |  | 75.0 |  |  |  |  |  |  |  | R 1,100.0 |  |  |  |  |  |  |
Unrecorded gain contingency, current procceding |  |  | 25.3 |  |  |  |  |  |  |  | 372.1 |  |  |  |  |  |  |
Estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 64.5 | R 948.0
Large Power Projects | South Africa | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of disputes | project | 2 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded | $ 7.8 | R 116.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Large Power Projects | South Africa | Demand Bonds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  | $ 2.3 |  |  |  |  |  |  |  |  |  |  |  |  |
Large Power Projects | South Africa | Demand Bonds | M H I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, amount awarded |  |  |  |  | 1.1 | R 18.4 |  |  |  |  |  |  |  |  |  |  |  |
Payment for bonds |  |  | 16.3 | R 239.6 |  |  |  |  | $ 14.3 | R 239.6 |  |  |  |  |  |  |  |
Other assets |  |  | $ 16.3 |  |  |  |  |  | $ 16.3 |  | R 239.6 | R 239.6 |  |  |  |  |  |
Large Power Projects | South Africa | Demand Bonds | Bonds Upon Completion Of Certain Administrative Milestones |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Face amount of debt |  |  |  |  | $ 4.0 |  |  |  |  |  |  |  |  |  |  |  |  |
Large Power Projects | South Africa | Demand Bonds Performance And Retention Money Guarantees | M H I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 16.2 |  |  |  |  |
Large Power Projects | South Africa | Demand Bonds Bond Guarantee Only Exercised By M H I | M H I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | $ 22.3 |  |  |  |  |
MHI April And July 2019 Claims | Large Power Projects | South Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27.7 | R 407.2 |  |
MHI Additional Claims | Large Power Projects | South Africa |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimate of possible loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 12.0 | R 176.2 |  |

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