SUPPLEMENTAL CASH FLOW INFORMATION (Supplemental Information Referable to Condensed Consolidated Statements of Cash Flows) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2022	Mar. 31, 2021
SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]
Interest (exclusive of amount capitalized)		$ 15.0	$ 13.2
Income taxes		(6.3)	0.2
Accrued liabilities for purchases of property, plant & equipment		41.0	24.8
Recognition of new and revised asset retirement obligations		2.3	1.7
Recognition of new and revised lease obligations for: Operating leases	[1]	3.3	10.1
Recognition of new and revised lease obligations for: Finance leases		1.2	2.8
Amounts referable to business acquisitions, Other liabilities assumed		2.5	0.0
Amounts referable to business acquisitions, Consideration payable to seller		$ 45.3	$ 0.0

[1] Excludes amounts acquired in business acquisitions.