ÐÇ¿Õ´«Ã½

Annual report pursuant to Section 13 and 15(d)

ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Summary Of Mine Closure Obligations) (Details)

v3.19.3.a.u2
ENVIRONMENTAL AND MINE CLOSURE OBLIGATIONS (Summary Of Mine Closure Obligations) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items] Ìý Ìý Ìý
Environmental $ 2.0 $ 2.5 Ìý
Asset Retirement Obligation 165.3 172.4 $ 168.4
Environmental Loss Contingency And Mine Reclamation And Closing Liability Current And Noncurrent 167.3 174.9 Ìý
Accrued Reclamation Costs, Current 2.4 2.9 Ìý
Environmental and mine closure obligations 164.9 172.0 Ìý
Mining and Pelletizing [Member] | Operating Segments [Member] Ìý Ìý Ìý
Loss Contingencies [Line Items] Ìý Ìý Ìý
Asset Retirement Obligation $ 22.0 $ 35.0 Ìý