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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 project	Jul. 23, 2020 ZAR (R)	May 31, 2021 USD ($)	May 31, 2021 ZAR (R)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 ZAR (R)	Dec. 31, 2022 USD ($) project	Dec. 31, 2022 ZAR (R)	Dec. 31, 2022 ZAR (R) project	Oct. 14, 2022 USD ($)	Oct. 14, 2022 ZAR (R)	Oct. 11, 2022 USD ($)	Oct. 11, 2022 ZAR (R)	Sep. 21, 2022 USD ($)	Sep. 21, 2022 ZAR (R)	Dec. 31, 2021 USD ($)	Jun. 04, 2021 USD ($)	Jun. 04, 2021 ZAR (R)	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												$ 197,400,000									$ 675,900,000
Large power projects
Loss Contingencies [Line Items]
Unrecorded gain contingency												58,400,000
Unrecorded gain contingency, current procceding												42,800,000
Payment for bonds					$ 6,700,000
South Africa | Large power projects
Loss Contingencies [Line Items]
Unrecorded gain contingency | R														R 1,000.0
Unrecorded gain contingency, current procceding | R														732.6
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																			$ 20,400,000	R 349.6		$ 46,100,000	R 790.0
South Africa | Large power projects | MHI April And July 2019 Claims
Loss Contingencies [Line Items]
Estimate of possible loss																								$ 23,800,000	R 407.2
South Africa | Large power projects | MHI Additional Claims
Loss Contingencies [Line Items]
Estimate of possible loss																								$ 10,300,000	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												1,700,000		29.2
Payment for bonds								$ 12,500,000	R 178.7	$ 14,300,000	R 239.6	24,400,000	R 418.3
Other assets												$ 19,100,000		R 327.5	$ 700,000	R 12.5	$ 5,000,000.0	R 90.8
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

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