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DISCONTINUED OPERATIONS (Narrative) (Details) $ in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2018 CAD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2018 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accumulated other comprehensive loss	$ (306.3)	$ (666.7)	$ (306.3)		$ (666.7)		$ (410.1)	$ (444.1)		$ (1,330.5)
Loans to and accounts receivable from the Canadian Entities	0.0		0.0				$ 51.6	51.6
Cash contribution				$ 19.0
Asia Pacific Iron Ore [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income tax expense	0.0	3.7	0.0		0.8
Unrealized Net Gain (Loss) on Foreign Currency Translation [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accumulated other comprehensive loss	$ 228.3	$ 225.1	228.3		$ 225.1	$ 226.1		$ 225.4	$ 226.6	$ 239.3
Discontinued Operations [Member] \| Asia Pacific Iron Ore [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Non-cash financing activities			$ 28.6

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

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