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Annual report pursuant to Section 13 and 15(d)

COMMITMENTS AND CONTINGENCIES (Details)

v3.8.0.1
COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loss Contingencies [Line Items] Ìý Ìý Ìý
Loans to and accounts receivables from the Canadian Entities $ 51.6 $ 48.6 Ìý
Contingent claims 55.6 0.0 Ìý
Short-term loan receivable 7.7 Ìý Ìý
LOSS FROM DISCONTINUED OPERATIONS, net of tax (18.7) (19.9) $ (892.1)
Accrual for Environmental Loss Contingencies 2.9 2.8 Ìý
Michigan Electricity Matters [Member] Ìý Ìý Ìý
Loss Contingencies [Line Items] Ìý Ìý Ìý
Loss Contingency Accrual 12.3 $ 13.6 Ìý
Wabush Scully Mine Sale [Member] Ìý Ìý Ìý
Loss Contingencies [Line Items] Ìý Ìý Ìý
LOSS FROM DISCONTINUED OPERATIONS, net of tax $ 31.4 Ìý Ìý