Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES (Schedule of Extinguishment of Debt) (Details)

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DEBT AND CREDIT FACILITIES (Schedule of Extinguishment of Debt) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 27, 2020
Mar. 13, 2020
Mar. 31, 2020
Mar. 31, 2019
Extinguishment of Debt [Line Items]        
Extinguishment of Debt, Amount     $ 739.9 $ 10.0
Gain (loss) on extinguishment of debt     3.2 (0.3)
7.625% 2021 AK Senior Notes [Member]        
Extinguishment of Debt [Line Items]        
Extinguishment of Debt, Amount $ 8.5 $ 364.2 372.7  
Gain (loss) on extinguishment of debt     0.4  
7.50% 2023 AK Senior Notes [Member]        
Extinguishment of Debt [Line Items]        
Extinguishment of Debt, Amount $ 56.5 $ 310.7 367.2  
Gain (loss) on extinguishment of debt     $ 2.8  
4.875% 2021 Senior Notes [Member]        
Extinguishment of Debt [Line Items]        
Extinguishment of Debt, Amount       10.0
Gain (loss) on extinguishment of debt       $ (0.3)