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CONTINGENT LIABILITIES AND OTHER MATTERS - Large Power Projects in South Africa (Details) R in Millions								1 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)	May 31, 2021 USD ($)	May 31, 2021 ZAR (R)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 ZAR (R)	Feb. 28, 2019 USD ($)	Feb. 28, 2019 ZAR (R)	Jul. 03, 2021 USD ($)	Jul. 03, 2021 ZAR (R)	Jun. 04, 2021 USD ($)	Jun. 04, 2021 ZAR (R)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 ZAR (R)	Jul. 31, 2019 USD ($)	Jul. 31, 2019 ZAR (R)
Contingent Liabilities and Other Matters
Number of disputes | dispute						9
Other assets														$ 609,400,000				$ 609,800,000
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														76,900,000	R 1,100.0
Unrecorded gain contingency, current proceeding														37,400,000	534.2
Number of disputes | project			2	2
Litigation settlement	$ 6,000,000.0	R 82.0	$ 8,600,000	R 126.6
Estimate of possible legal claim deemed unlikely																$ 66,400,000	R 950.0
SOUTH AFRICA | Large Power Projects | Demand Bonds
Contingent Liabilities and Other Matters
Original loan balance						$ 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								$ 12,500,000	R 178.7	$ 14,300,000	R 239.6	$ 29,300,000	R 418.3
Other assets														$ 29,300,000	R 418.3			$ 29,300,000	R 418.3
SOUTH AFRICA | Large Power Projects | Demand Bonds | Bonds Upon Completion Of Certain Administrative Milestones
Contingent Liabilities and Other Matters
Original loan balance						$ 4,800,000
SOUTH AFRICA | Large Power Projects | MHI April And July 2019 Claims
Contingent Liabilities and Other Matters
Estimate of possible legal claim deemed unlikely																				$ 28,500,000	R 407.2
SOUTH AFRICA | Large Power Projects | MHI Additional Claims
Contingent Liabilities and Other Matters
Estimate of possible legal claim deemed unlikely																				$ 12,300,000	R 176.2

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