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Property, Plant and Equipment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 19,961.1	$ 18,982.0
Less: accumulated depreciation and depletion	8,106.8	7,292.0
Property, plant and equipment, net	11,854.3	11,690.0
Capitalized interest on major construction projects	33.3	28.5	$ 22.1
Depreciation	846.4	877.6	$ 878.2
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	325.7	340.3
Mining properties and rights
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	5,035.2	4,979.2
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	3,306.2	3,108.7
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	9,846.9	9,294.1
Construction in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	$ 1,447.1	$ 1,259.7

X

- Definition

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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