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Annual report pursuant to Section 13 and 15(d)

RELATED PARTIES (Narrative) (Details)

v3.10.0.1
RELATED PARTIES (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Facility
Dec. 31, 2017
USD ($)
installment
Segment Reporting Information [Line Items] Ìý Ìý
Noncontrolling Interest, Ownership Percentage by Parent 100.00% Ìý
Due to Related Parties, Current $ 1.8 $ 12.3
Acquisition of Noncontrolling Interest Ìý $ (105.0)
Mining and Pelletizing [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Number Of Mines | Facility 4 Ìý
Joint Venture Partners [Member] | Mining and Pelletizing [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Number Of Mines | Facility 1 Ìý
Empire [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Noncontrolling Interest, Ownership Percentage by Parent Ìý 100.00%
Increase in Ownership Equity Ìý 21.00%
Distribution of Noncontrolling Interest Ìý $ 132.7
Noncontrolling Interest Purchase, Number Of Installment Payments | installment Ìý 3
Stockholders' Equity, Period Increase (Decrease) Ìý $ (12.1)
Acquisition of Noncontrolling Interest Ìý $ (116.7)
Other Liabilities [Member] | Empire [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Noncontrolling Interest Purchase, Installment Amount $ 44.2 Ìý
Other Noncurrent Liabilities [Member] | Empire [Member] Ìý Ìý
Segment Reporting Information [Line Items] Ìý Ìý
Noncontrolling Interest Purchase, Installment Amount $ 44.2 Ìý