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Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 20,713.4	$ 19,961.1
Less: accumulated depreciation and depletion	8,238.1	8,106.8
Property, plant and equipment, net	12,475.3	11,854.3
Capitalized interest on major construction projects	30.1	33.3	$ 28.5
Depreciation	811.8	846.4	$ 877.6
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	341.6	325.7
Mining properties and rights
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	5,791.3	5,035.2
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	3,452.5	3,306.2
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	9,893.6	9,846.9
Construction in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 1,234.4	$ 1,447.1

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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