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Contingent Liabilities and Other Matters - Large Power Projects in South Africa (Details) R in Millions					3 Months Ended										12 Months Ended
	Jan. 16, 2020 ZAR (R)	Jan. 16, 2020 USD ($)	Oct. 30, 2018 ZAR (R)	Oct. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Sep. 28, 2019 USD ($)	Jun. 29, 2019 USD ($)	Mar. 30, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 29, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jul. 01, 2017 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2019 ZAR (R) project	Dec. 31, 2019 USD ($) project	Jul. 31, 2019 ZAR (R)	Jul. 31, 2019 USD ($)	Feb. 26, 2019 ZAR (R)	Feb. 26, 2019 USD ($)
Loss Contingencies [Line Items]
Number of large power projects | project																		2	2
Revenues					$ (444,600,000)	$ (364,800,000)	$ (372,400,000)	$ (343,600,000)	$ (445,000,000.0)	$ (362,500,000)	$ (379,200,000)	$ (351,900,000)			$ (1,525,400,000)	$ (1,538,600,000)	$ (1,425,800,000)
Demand Bonds
Loss Contingencies [Line Items]
Face amount of debt																			$ 65,100,000
Demand Bonds Stringent Payment Requirements
Loss Contingencies [Line Items]
Face amount of debt																			23,300,000
South Africa
Loss Contingencies [Line Items]
Revenues															6,100,000	(72,700,000)	(56,900,000)
Large Power Projects | South Africa
Loss Contingencies [Line Items]
Unrecorded gain contingency																		R 1,133.3	80,800,000
Estimate of possible loss																			$ 12,600,000			R 948.0	$ 67,600,000
Reportable and other operating segments | Large Power Projects | Revisions in estimates for large power projects | South Africa
Loss Contingencies [Line Items]
Revenues															0
All Other
Loss Contingencies [Line Items]
Revenues															1,600,000	(98,600,000)	(93,800,000)
All Other | Reportable and other operating segments | Large Power Projects | Revisions in estimates for large power projects | South Africa
Loss Contingencies [Line Items]
Revenues							$ 6,000,000.0	$ 17,500,000					$ 23,400,000	$ 13,500,000	$ 23,500,000	$ 2,700,000	$ 36,900,000
MHPSA April And July 2019 Claims | Large Power Projects | South Africa
Loss Contingencies [Line Items]
Estimate of possible loss																				R 407.2	$ 29,000,000.0
MHPSA Additional Claims | Large Power Projects | South Africa
Loss Contingencies [Line Items]
Estimate of possible loss | R																		R 176.2
DBT Technologies
Loss Contingencies [Line Items]
Litigation settlement awarded to other party			R 256.0	$ 18,200,000
DBT Technologies | Subsequent Event
Loss Contingencies [Line Items]
Litigation settlement awarded to other party	R 19.4	$ 1,400,000

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