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Quarterly report pursuant to Section 13 or 15(d)

ASSET RETIREMENT OBLIGATIONS (Summary Of Asset Retirement Obligations) (Details)

v3.20.1
ASSET RETIREMENT OBLIGATIONS (Summary Of Asset Retirement Obligations) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items] Ìý Ìý Ìý
Asset Retirement Obligation $ 181.4 [1] $ 165.3 [1] $ 172.4
Asset Retirement Obligation, Current 2.2 2.1 Ìý
Asset Retirement Obligations, Noncurrent 179.2 163.2 Ìý
Operating Segments [Member] | Mining and Pelletizing [Member] Ìý Ìý Ìý
Loss Contingencies [Line Items] Ìý Ìý Ìý
Asset Retirement Obligation $ 32.5 $ 22.0 Ìý
[1]
1 Includes $32.5 million and $22.0 million related to our active operations as of March 31, 2020 and December 31, 2019, respectively.