PROPERTY, PLANT & EQUIPMENT (Property, Plant and Equipment) (Details) - USD ($) $ in Millions		Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Total, gross		$ 11,835.5	$ 11,306.4
Less allowances for depreciation, depletion and amortization		5,617.8	5,255.1
Property, plant & equipment, net		6,217.7	6,051.3
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Total, gross	[1]	4,292.6	3,991.1
Buildings [Member]
Property, Plant and Equipment [Line Items]
Total, gross		204.4	223.3
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total, gross		6,785.5	6,454.2
Finance Leases [Member]
Property, Plant and Equipment [Line Items]
Total, gross		62.3	93.2
Deferred Asset Retirement Costs [Member]
Property, Plant and Equipment [Line Items]
Total, gross		171.3	165.9
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total, gross		319.4	378.7
Depletable Land [Member]
Property, Plant and Equipment [Line Items]
Total, gross		$ 2,684.4	$ 2,445.6

[1] Includes depletable land as follows: December 31, 2023 — $2,684.4 million and December 31, 2022 — $2,445.6 million.