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Annual report pursuant to Section 13 and 15(d)

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

v3.10.0.1
SEGMENT REPORTING (Summary of Assets by Segment) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items] Ìý Ìý Ìý Ìý
TOTAL ASSETS $ 3,529.6 $ 2,990.2 $ 2,953.4 $ 1,923.9
Mining and Pelletizing [Member] Ìý Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý Ìý
TOTAL ASSETS 1,694.1 Ìý 1,500.6 1,372.5
Metallics [Member] Ìý Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý Ìý
TOTAL ASSETS 265.9 Ìý 13.4 0.0
Total Segment Assets [Member] Ìý Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý Ìý
TOTAL ASSETS 1,960.0 Ìý 1,514.0 1,372.5
Corporate [Member] Ìý Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý Ìý
TOTAL ASSETS 1,557.2 Ìý 1,300.6 396.3
Discontinued Operations [Member] Ìý Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý Ìý
Disposal Group, Including Discontinued Operation, Assets $ 12.4 Ìý $ 138.8 $ 155.1