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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
Jul. 23, 2020
ZAR (R)
Oct. 16, 2019
USD ($)
Oct. 16, 2019
ZAR (R)
May 31, 2021
USD ($)
May 31, 2021
ZAR (R)
Sep. 30, 2020
USD ($)
Sep. 30, 2020
ZAR (R)
Dec. 31, 2021
USD ($)
project
Dec. 31, 2021
ZAR (R)
Dec. 31, 2021
ZAR (R)
project
Jul. 23, 2021
project
Jun. 04, 2021
USD ($)
Jun. 04, 2021
ZAR (R)
Dec. 31, 2020
USD ($)
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                           $ 675,900,000           $ 591,700,000    
Large power projects                                            
Loss Contingencies [Line Items]                                            
Unrecorded gain contingency                           62,600,000                
Unrecorded gain contingency, current procceding                           35,500,000                
Payment for bonds         $ 6,700,000                                  
South Africa | Subsidiary                                            
Loss Contingencies [Line Items]                                            
Gain (loss) on litigation settlement               $ 1,800,000 R 27.0                          
Litigation settlement, tax effect               3,800,000                            
South Africa | Subsidiary | Put Option                                            
Loss Contingencies [Line Items]                                            
Litigation settlement awarded to other party               $ 15,600,000 230.0                          
Net redemption value | R                 R 257.0                          
South Africa | Large power projects                                            
Loss Contingencies [Line Items]                                            
Unrecorded gain contingency | R                               R 1,000.0            
Unrecorded gain contingency, current procceding | R                               566.5            
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                                   $ 49,500,000 R 790.0      
South Africa | Large power projects | MHI April And July 2019 Claims                                            
Loss Contingencies [Line Items]                                            
Estimate of possible loss                                         $ 25,500,000 R 407.2
South Africa | Large power projects | MHI Additional Claims                                            
Loss Contingencies [Line Items]                                            
Estimate of possible loss                                         $ 11,000,000.0 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                           1,800,000                
Payment for bonds                   $ 12,500,000 R 178.7 $ 14,300,000 R 239.6 26,200,000 R 418.3              
Other assets                           $ 26,200,000   R 418.3            
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