SUPPLEMENTAL CASH FLOW INFORMATION (Tables)	12 Months Ended
	Dec. 31, 2021
SUPPLEMENTAL CASH FLOW INFORMATION [Abstract]
Supplemental Information Referable to Condensed Consolidated Statements of Cash Flows	in millions2021 2020 2019 Cash Payments Interest (exclusive of amount capitalized)$       138.0  $       129.2  $       129.2  Income taxes 127.9  95.9  56.8  Noncash Investing and Financing Activities Accrued liabilities for purchases of property, plant & equipment$         71.4  $         55.9  $         57.3  Recognition of new and revised asset retirement obligations (AROs) 1 17.1  73.2  (13.9) Recognition of new and revised right-of-use (ROU) assets for 1 Operating lease liabilities 106.9  49.6  444.5  Finance lease liabilities 13.3  6.6  1.2  Amounts referable to business acquisitions Debt assumed 443.7  0.0  0.0  Other liabilities assumed 243.8  5.9  4.4  Consideration payable to seller 0.0  9.0  0.0  Fair value of noncash assets and liabilities exchanged 0.0  21.2  0.0  Debt issued for purchases of property, plant & equipment 0.0  2.6  0.0  1Excludes amounts acquired in business acquisitions. Additionally, the 2019 lease amount includes the initial right-of-use assets resulting from our adoption of ASU 2016-02, “Leases.”