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BASIS OF PRESENTATION AND SIGNIFICANT ACCOUNTING POLICIES (Adoption of New Accounting Standard) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
COST OF GOODS SOLD AND OPERATING EXPENSES $ (1,828.5) $ (1,719.7) $ (1,776.8)
Selling, general and administrative expenses (105.8) (117.8) (110.0)
Miscellaneous - net 27.7 (30.7) 24.8
OPERATING INCOME (LOSS) 423.6 240.8 151.3
Other non-operating income (expense) 3.2 0.4 (2.6)
Net income (loss) 363.1 $ 199.3 $ (748.4)
Estimated Adjustment [Member]      
COST OF GOODS SOLD AND OPERATING EXPENSES 2.4    
Selling, general and administrative expenses (7.7)    
Miscellaneous - net (1.7)    
OPERATING INCOME (LOSS) (7.0)    
Other non-operating income (expense) 7.0    
Net income (loss) 0.0    
Estimated post adjustment [Member]      
COST OF GOODS SOLD AND OPERATING EXPENSES (1,826.1)    
Selling, general and administrative expenses (113.5)    
Miscellaneous - net 26.0    
OPERATING INCOME (LOSS) 416.6    
Other non-operating income (expense) 10.2    
Net income (loss) $ 363.1