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Quarterly report pursuant to Section 13 or 15(d)

SEGMENT REPORTING (Summary of Assets by Segment) (Details)

v3.19.1
SEGMENT REPORTING (Summary of Assets by Segment) (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items] Ìý Ìý
TOTAL ASSETS $ 3,306.3 $ 3,529.6
Mining and Pelletizing [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
TOTAL ASSETS 1,774.5 1,694.1
Metallics [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
TOTAL ASSETS 350.0 265.9
Operating Segments [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
TOTAL ASSETS 2,124.5 1,960.0
Corporate and Other [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
TOTAL ASSETS $ 1,181.8 $ 1,569.6