Cleveland-Cliffs Inc. Quarterly report pursuant to Section 13 or 15(d)

Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE MEASUREMENTS (Fair Value Measurements, Nonrecurring) (Details)

FAIR VALUE MEASUREMENTS (Fair Value Measurements, Nonrecurring) (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Jan. 01, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans to and accounts receivable from the Canadian Entities	$ 50.4		$ 51.6	$ 51.6
Fair Value, Asset, Measured on a Nonrecurring Basis, Gain (Loss) Included in Earnings	(1.2)		3.0
Impairment Charges, CIP	(2.6)
Contingent Liabilities recognized in Consolidated Financials			0.0
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX	$ 0.5	$ 0.5
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent Liabilities recognized in Consolidated Financials			0.0
Wabush Scully Mine Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
INCOME FROM DISCONTINUED OPERATIONS, NET OF TAX			$ 31.4

- Definition

Amount after tax of income (loss) from a discontinued operation including the portion attributable to the noncontrolling interest. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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