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Quarterly report pursuant to Section 13 or 15(d)

SEGMENT REPORTING (Reconciliation of Assets from Segment to Consolidated) (Details)

v3.20.1
SEGMENT REPORTING (Reconciliation of Assets from Segment to Consolidated) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items] Ìý Ìý
TOTAL ASSETS $ 8,912.3 $ 3,503.8
Steel and Manufacturing [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
TOTAL ASSETS 6,442.4 913.6
Mining and Pelletizing [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
TOTAL ASSETS 1,752.4 1,643.1
Operating Segments [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
TOTAL ASSETS 8,194.8 2,556.7
Corporate and Other [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
TOTAL ASSETS $ 717.5 $ 947.1