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Annual report pursuant to Section 13 and 15(d)

BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)

v3.19.3.a.u2
BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
T in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
T
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
T
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
unit
T
Dec. 31, 2018
USD ($)
T
Dec. 31, 2017
USD ($)
T
Jan. 01, 2018
USD ($)
Dec. 31, 2016
USD ($)
Related Party Transaction [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 357.9 $ 424.2 $ 357.9 $ 424.2 $ (444.1) $ (1,330.5)
Number of Reporting Units | unit 2
Noncontrolling Interest, Ownership Percentage by Parent 100.00% 100.00%
Net Income (Loss) Attributable to Noncontrolling Interest $ 0.0 0.0 (3.9)
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net from product sales and services 7.5 422.6 119.3
Foreign Currency Transaction Gain (Loss), Realized 0.0 228.1 0.0
Revenues $ 534.1 $ 555.6 $ 743.2 $ 157.0 $ 696.3 $ 741.8 $ 714.3 $ 180.0 1,989.9 2,332.4 1,866.0
Net income $ 292.8 $ 1,128.1 $ 363.1
Hibbing [Member]
Related Party Transaction [Line Items]
Ownership interest, equity method investment 23.00% 23.00%
Mining and Pelletizing [Member]
Related Party Transaction [Line Items]
Quantity Of Finished Goods at ports | T 1.0 0.8 1.0 0.8 1.5
Revenues $ 1,989.9 $ 2,332.4 $ 1,866.0
Empire [Member]
Related Party Transaction [Line Items]
Distribution of Noncontrolling Interest 132.7
Stockholders' Equity, Period Increase (Decrease) (12.1)
Net Income (Loss) Attributable to Noncontrolling Interest (3.9)
Acquisition of Noncontrolling Interest (116.7)
Tilden [Member]
Related Party Transaction [Line Items]
Distribution of Noncontrolling Interest 105.0
Stockholders' Equity, Period Increase (Decrease) (89.1)
Acquisition of Noncontrolling Interest $ (15.9)
Other Noncurrent Liabilities [Member] | Hibbing [Member]
Related Party Transaction [Line Items]
Equity Method Investments $ (18.0) $ (15.4) $ (18.0) (15.4)
Other Current Liabilities [Member] | Empire [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest Purchase, Installment Amount $ 44.2 44.2
Tilden [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent 100.00% 100.00%
Increase in Ownership Equity 15.00%
Empire [Member]
Related Party Transaction [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent 100.00% 100.00%
Increase in Ownership Equity 21.00%
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Related Party Transaction [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest $ 34.0
Revenues 68.1
Net income $ 46.2
Sales [Member]
Related Party Transaction [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net from product sales and services $ 120.6