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Quarterly report pursuant to Section 13 or 15(d)

SEGMENT REPORTING - Segment Assets (Details)

v3.20.2
SEGMENT REPORTING - Segment Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items] Ìý Ìý
Total assets $ 8,480.9 $ 3,503.8
Corporate and Other [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Total assets 491.9 947.1
Operating Segments [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Total assets 7,989.0 2,556.7
Operating Segments [Member] | Steel and Manufacturing [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Total assets 6,345.7 913.6
Operating Segments [Member] | Mining and Pelletizing [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Total assets $ 1,643.3 $ 1,643.1