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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.