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PROPERTY, PLANT & EQUIPMENT
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT & EQUIPMENT PROPERTY, PLANT & EQUIPMENT
Balances of major classes of assets and allowances for depreciation, depletion and amortization at December 31 are as follows:
in millions20242023
Land and land improvements 1
$5,804.8 $4,292.6 
Buildings304.4 204.4 
Machinery and equipment7,717.2 6,785.5 
Finance leases (see Note 7)54.7 62.3 
Deferred asset retirement costs235.6 171.3 
Construction in progress400.1 319.4 
Total, gross property, plant & equipment$14,516.8 $11,835.5 
Allowances for depreciation, depletion and amortization(6,055.3)(5,617.8)
Total, net property, plant & equipment$8,461.5 $6,217.7 
1Includes depletable land of $4,015.7 million and $2,684.4 million as of December 31, 2024 and 2023, respectively.
Capitalized interest costs with respect to qualifying construction projects and total interest costs incurred before recognition of the capitalized amount for the years ended December 31 are as follows:
in millions202420232022
Capitalized interest cost$4.0 $3.7 $3.6 
Total interest cost incurred before recognition of the capitalized amount195.2 199.8 172.8