PROPERTY, PLANT & EQUIPMENT (Property, Plant and Equipment) (Details) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total, gross		$ 10,444.4	$ 9,102.1
Less allowances for depreciation, depletion and amortization		4,897.6	4,676.1
Property, plant & equipment, net		5,546.8	4,426.0
Land and Land Improvements [Member]
Property, Plant and Equipment [Line Items]
Total, gross	[1]	3,631.7	3,013.3
Buildings [Member]
Property, Plant and Equipment [Line Items]
Total, gross		182.9	145.4
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Total, gross		6,109.2	5,517.9
Finance Leases [Member]
Property, Plant and Equipment [Line Items]
Total, gross		36.3	7.8
Deferred Asset Retirement Costs [Member]
Property, Plant and Equipment [Line Items]
Total, gross	[2]	182.5	240.8
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Total, gross		301.8	176.9
Depletable Land [Member]
Property, Plant and Equipment [Line Items]
Total, gross		$ 2,238.4	$ 1,712.1

[1] Includes depletable land as follows: December 31, 2021 — $2,238.4 million and December 31, 2020 — $1,712.1 million.

[2] This significant decrease is due to the write-off of assets with a corresponding write-off of allowances for depreciation