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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