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Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Narrative) (Details)

v3.8.0.1
FAIR VALUE MEASUREMENTS (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý Ìý Ìý
Loans Receivable, Fair Value Disclosure $ 7.7 Ìý $ 7.7 Ìý Ìý
Contingent Liabilities recognized in Consolidated Financials 0.0 Ìý 0.0 Ìý $ 37.2
Cash equivalents 77.0 Ìý $ 77.0 Ìý 177.0
Management Estimate of 62% Fe Ìý Ìý 62.00% Ìý Ìý
Derivative Asset 89.5 Ìý $ 89.5 Ìý 33.1
Derivative Asset, Current 89.5 Ìý 89.5 Ìý 33.1
Derivative Liability, Current 9.3 Ìý 9.3 Ìý 0.5
Derivative Liability 9.3 Ìý 9.3 Ìý 0.5
INCOME (LOSS) FROM DISCONTINUED OPERATIONS, NET OF TAX 32.3 $ (2.7) (13.6) $ (0.6) Ìý
Fair Value, Inputs, Level 1 [Member] Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý Ìý Ìý
Cash equivalents 40.0 Ìý 40.0 Ìý 177.0
Derivative Asset 0.0 Ìý 0.0 Ìý 0.0
Derivative Liability 0.0 Ìý 0.0 Ìý 0.0
Fair Value, Inputs, Level 2 [Member] Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý Ìý Ìý
Cash equivalents 37.0 Ìý 37.0 Ìý 0.0
Derivative Asset 0.0 Ìý 0.0 Ìý 1.5
Derivative Liability 0.0 Ìý 0.0 Ìý 0.0
Fair Value, Inputs, Level 3 [Member] Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý Ìý Ìý
Contingent Liabilities recognized in Consolidated Financials 0.0 Ìý 0.0 Ìý Ìý
Cash equivalents 0.0 Ìý 0.0 Ìý 0.0
Derivative Asset 89.5 Ìý 89.5 Ìý 31.6
Derivative Liability 9.3 Ìý 9.3 Ìý 0.5
Not Designated as Hedging Instrument [Member] Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý Ìý Ìý
Derivative Asset 89.5 Ìý 89.5 Ìý 33.1
Derivative Liability 9.3 Ìý 9.3 Ìý 0.5
Derivative Financial Instruments, Assets [Member] | Not Designated as Hedging Instrument [Member] | Customer Supply Agreement [Member] Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý Ìý Ìý
Derivative Asset, Current 84.8 Ìý 84.8 Ìý 21.3
U S Iron Ore And Asia Pacific Iron Ore [Member] | Derivative Financial Instruments, Assets [Member] | Not Designated as Hedging Instrument [Member] | Provisional Pricing Arrangements [Member] Ìý Ìý Ìý Ìý Ìý
Fair Value, Assets And Liabilities Components [Line Items] Ìý Ìý Ìý Ìý Ìý
Derivative Asset, Current $ 4.7 Ìý $ 4.7 Ìý $ 10.3