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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2020
Property, Plant and Equipment [Abstract]  
Property Plant And Equipment PROPERTY, PLANT AND EQUIPMENT
Property, plant and equipment consist of the following:
 December 31,
(in millions)20202019
Land$325.7 $340.3 
Mineral properties and rights5,035.2 4,979.2 
Buildings and leasehold improvements3,306.2 3,108.7 
Machinery and equipment9,846.9 9,294.1 
Construction in-progress1,447.1 1,259.7 
19,961.1 18,982.0 
Less: accumulated depreciation and depletion8,106.8 7,292.0 
$11,854.3 $11,690.0 
Depreciation and depletion expense was $846.4 million, $877.6 million and $878.2 million for 2020, 2019 and 2018, respectively. Capitalized interest on major construction projects was $33.3 million, $28.5 million and $22.1 million for 2020, 2019 and 2018.