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Quarterly report pursuant to Section 13 or 15(d)

SEGMENT REPORTING - Segment Capital Additions (Details)

v3.20.2
SEGMENT REPORTING - Segment Capital Additions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Segment Reporting Information [Line Items] Ìý Ìý Ìý Ìý
Property, Plant and Equipment, Additions $ 102.3 $ 184.7 $ 333.0 $ 505.6
Steel and Manufacturing [Member] Ìý Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý Ìý
Property, Plant and Equipment, Additions 88.0 160.5 266.8 398.0
Mining and Pelletizing [Member] Ìý Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý Ìý
Property, Plant and Equipment, Additions 13.3 22.1 64.9 104.5
Corporate and Other [Member] Ìý Ìý Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý Ìý Ìý
Property, Plant and Equipment, Additions $ 1.0 $ 2.1 $ 1.3 $ 3.1