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CONTINGENT LIABILITIES AND OTHER MATTERS - Large Power Projects in South Africa (Details) R in Millions										1 Months Ended
	Oct. 02, 2021 USD ($)	Oct. 02, 2021 ZAR (R)	Apr. 28, 2021 USD ($)	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 ($)	Sep. 30, 2020 ZAR (R)	Oct. 02, 2021 ZAR (R)	Jun. 04, 2021 USD ($)	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	$ 590,900,000																$ 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	72,500,000													R 1,100.0
Unrecorded gain contingency, current proceeding	37,400,000													566.5
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															$ 62,600,000	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	1,900,000
Payment for bonds	27,600,000	R 418.3								$ 12,500,000	R 178.7	$ 14,300,000	R 239.6
Other assets	$ 27,600,000													R 418.3			$ 27,600,000	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								$ 4,500,000
SOUTH AFRICA | Large Power Projects | MHI April And July 2019 Claims
Contingent Liabilities and Other Matters
Estimate of possible legal claim deemed unlikely																			$ 26,900,000	R 407.2
SOUTH AFRICA | Large Power Projects | MHI Additional Claims
Contingent Liabilities and Other Matters
Estimate of possible legal claim deemed unlikely																			$ 11,600,000	R 176.2

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