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CONTINGENT LIABILITIES AND OTHER MATTERS - Large Power Projects in South Africa (Details)
R in Millions
1 Months Ended 3 Months Ended
Oct. 02, 2021
USD ($)
Oct. 02, 2021
ZAR (R)
Apr. 28, 2021
USD ($)
dispute
Apr. 28, 2021
ZAR (R)
dispute
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 ($)
Sep. 30, 2020
ZAR (R)
Apr. 02, 2022
USD ($)
project
Apr. 02, 2022
ZAR (R)
Dec. 31, 2021
USD ($)
Dec. 31, 2021
ZAR (R)
Jun. 04, 2021
USD ($)
Jun. 04, 2021
ZAR (R)
Jul. 31, 2019
USD ($)
Jul. 31, 2019
ZAR (R)
Contingent Liabilities and Other Matters                                          
Number of large power projects | project                           2              
Number of disputes | dispute               9                          
Other assets                           $ 676,600,000   $ 675,900,000          
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                           69,000,000.0 R 1,000.0            
Unrecorded gain contingency, current proceeding                           39,100,000 566.5            
Number of disputes     2 2 2 2   1                          
Litigation settlement     $ 6,000,000.0 R 82.0 $ 8,600,000 R 126.6                              
Estimate of possible legal claim deemed unlikely                                   $ 54,500,000 R 790.0    
SOUTH AFRICA | Large Power Projects | Demand Bonds                                          
Contingent Liabilities and Other Matters                                          
Face amount of debt               $ 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                           2,000,000.0              
Payment for bonds $ 28,900,000 R 418.3               $ 12,500,000 R 178.7 $ 14,300,000 R 239.6                
Other assets                           $ 28,900,000 R 418.3 $ 28,900,000 R 418.3        
SOUTH AFRICA | Large Power Projects | Demand Bonds | Bonds Upon Completion Of Certain Administrative Milestones                                          
Contingent Liabilities and Other Matters                                          
Face amount of debt               $ 4,300,000                          
SOUTH AFRICA | Large Power Projects | MHI April And July 2019 Claims                                          
Contingent Liabilities and Other Matters                                          
Estimate of possible legal claim deemed unlikely                                       $ 28,100,000 R 407.2
SOUTH AFRICA | Large Power Projects | MHI Additional Claims                                          
Contingent Liabilities and Other Matters                                          
Estimate of possible legal claim deemed unlikely                                       $ 12,200,000 R 176.2