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Property, Plant and Equipment (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Capital Leased Assets, Gross		$ 340.9	$ 345.0
Depreciation		878.2	659.4	$ 703.8
Property, plant and equipment, at cost		18,681.0	15,985.8
Less: accumulated depreciation and depletion		6,934.5	6,274.1
Property, plant and equipment, net		11,746.5	9,711.7
Capitalized interest on major construction projects		22.1	23.9	$ 38.5
Land
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost		321.5	245.9
Mining properties and rights
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost		4,478.2	3,540.4
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost		2,760.9	2,473.0
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost	[1]	8,955.7	7,933.5
Construction in-progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, at cost		$ 2,164.7	$ 1,793.0
[1] Includes assets under capital leases of approximately $340.9 million and $345.0 million as of December 31, 2018 and 2017, respectively.

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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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