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Contingent Liabilities and Other Matters - Large Power Projects in South Africa (Details) R in Millions, $ in Millions									1 Months Ended
	Feb. 22, 2021 USD ($) project	Feb. 22, 2021 ZAR (R) project	Dec. 31, 2020 USD ($) project	Dec. 31, 2020 ZAR (R)	Jul. 23, 2020 USD ($) dispute	Jul. 23, 2020 ZAR (R)	Oct. 16, 2019 USD ($)	Oct. 16, 2019 ZAR (R)	Sep. 30, 2020 USD ($)	Sep. 30, 2020 ZAR (R)	Dec. 31, 2020 ZAR (R) project	Sep. 30, 2020 ZAR (R)	Sep. 26, 2020 USD ($)	Dec. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)	Jul. 31, 2019 ZAR (R)	Feb. 26, 2019 USD ($)	Feb. 26, 2019 ZAR (R)
Loss Contingencies [Line Items]
Number of large power projects | project			2								2
Number of disputes | dispute					9
Other assets			$ 616.4											$ 605.5
South Africa | Subsidiary
Loss Contingencies [Line Items]
Loss on litigation settlement							$ 1.8	R 27.0
Litigation settlement, tax effect							3.8
South Africa | Subsidiary | Put Option
Loss Contingencies [Line Items]
Litigation settlement awarded to other party							$ 15.6	230.0
Net redemption value | R								R 257.0
Large Power Projects | South Africa
Loss Contingencies [Line Items]
Unrecorded gain contingency			75.0								R 1,100.0
Unrecorded gain contingency, current procceding			25.3								372.1
Estimate of possible loss																	$ 64.5	R 948.0
Large Power Projects | South Africa | Subsequent Event
Loss Contingencies [Line Items]
Number of disputes | project	2	2
Litigation settlement, amount awarded	$ 7.8	R 116.4
Large Power Projects | South Africa | Demand Bonds
Loss Contingencies [Line Items]
Face amount of debt					$ 2.3
Large Power Projects | South Africa | Demand Bonds | M H I
Loss Contingencies [Line Items]
Litigation settlement, amount awarded					1.1	R 18.4
Payment for bonds			16.3	R 239.6					$ 14.3	R 239.6
Other assets			$ 16.3						$ 16.3		R 239.6	R 239.6
Large Power Projects | South Africa | Demand Bonds | Bonds Upon Completion Of Certain Administrative Milestones
Loss Contingencies [Line Items]
Face amount of debt					$ 4.0
Large Power Projects | South Africa | Demand Bonds Performance And Retention Money Guarantees | M H I
Loss Contingencies [Line Items]
Long-term debt													$ 16.2
Large Power Projects | South Africa | Demand Bonds Bond Guarantee Only Exercised By M H I | M H I
Loss Contingencies [Line Items]
Long-term debt													$ 22.3
MHI April And July 2019 Claims | Large Power Projects | South Africa
Loss Contingencies [Line Items]
Estimate of possible loss															$ 27.7	R 407.2
MHI Additional Claims | Large Power Projects | South Africa
Loss Contingencies [Line Items]
Estimate of possible loss															$ 12.0	R 176.2

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