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DEBT AND CREDIT FACILITIES DEBT AND CREDIT FACILITIES (Debt Restructuring) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Extinguishment of Debt [Line Items]          
Extinguishment of Debt, Amount       $ 1,610.7  
Gain (loss) on extinguishment/restructuring of debt $ (88.6)   $ (18.3) (165.4) $ 164.1
$540 Million 8.25% 2020 Lien Notes [Member]          
Extinguishment of Debt [Line Items]          
Extinguishment of Debt, Amount   $ 35.6   540.0  
Gain (loss) on extinguishment/restructuring of debt (88.6)     (93.5)  
$218.5 Million 8.00% 2020 Lien Notes [Member]          
Extinguishment of Debt [Line Items]          
Extinguishment of Debt, Amount       218.5  
Gain (loss) on extinguishment/restructuring of debt 0.0     45.1  
$544 Million 7.75% 2020 Lien Notes[Member]          
Extinguishment of Debt [Line Items]          
Extinguishment of Debt, Amount       430.1  
Gain (loss) on extinguishment/restructuring of debt 0.0     (104.5)  
$400 Million 5.90% 2020 Senior Notes [Member]          
Extinguishment of Debt [Line Items]          
Extinguishment of Debt, Amount       136.7  
Gain (loss) on extinguishment/restructuring of debt 0.0     (7.8)  
$500 million 4.80% 2020 Senior Notes [Member]          
Extinguishment of Debt [Line Items]          
Extinguishment of Debt, Amount       114.4  
Gain (loss) on extinguishment/restructuring of debt 0.0     (1.9)  
$700 Million 4.875% 2021 Senior Note [Member]          
Extinguishment of Debt [Line Items]          
Extinguishment of Debt, Amount       171.0  
Gain (loss) on extinguishment/restructuring of debt $ 0.0     $ (2.8)