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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

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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