PROPERTY, PLANT & EQUIPMENT (Tables)	12 Months Ended
	Dec. 31, 2021
PROPERTY, PLANT & EQUIPMENT [Abstract]
Property, Plant and Equipment	in millions2021 2020 Property, Plant & Equipment Land and land improvements 1$       3,631.7  $      3,013.3  Buildings 182.9  145.4  Machinery and equipment 6,109.2  5,517.9  Finance leases (see Note 7) 36.3  7.8  Deferred asset retirement costs (see Note 17) 2 182.5  240.8  Construction in progress 301.8  176.9  Total, gross$     10,444.4  $      9,102.1  Less allowances for depreciation, depletion and amortization 4,897.6  4,676.1  Total, net$       5,546.8  $      4,426.0  1Includes depletable land as follows: December 31, 2021 — $2,238.4 million and December 31, 2020 — $1,712.1 million. 2This significant decrease is due to the write-off of assets with a corresponding write-off of allowances for depreciation.
Capitalized Interest Costs and Total Interest Costs Incurred	in millions2021 2020 2019 Capitalized interest cost$             4.2  $            3.5  $            3.9  Total interest cost incurred before recognition of the capitalized amount 153.5  139.5  134.1