Annual report pursuant to Section 13 and 15(d)

DEBT AND CREDIT FACILITIES (Debt Extinguishment) (Details)

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DEBT AND CREDIT FACILITIES (Debt Extinguishment) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Extinguishment of Debt [Line Items]      
Debt Extinguished $ 724.0 $ 227.4 $ 1,610.7
Gain (loss) on extinguishment of debt (18.2) (6.8) (165.4)
Debt redemption premiums paid (5.3) (7.1) (110.0)
$700 Million 4.875% 2021 Senior Notes [Member]      
Extinguishment of Debt [Line Items]      
Debt Extinguished 124.0 14.4 171.0
Gain (loss) on extinguishment of debt $ (5.3) 0.1 (2.8)
$1.075 Billion 5.75% 2025 Senior Notes [Member]      
Extinguishment of Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.75%    
Debt Extinguished $ 600.0 1.7  
Gain (loss) on extinguishment of debt $ (12.9) 0.1  
$400 Million 5.90% 2020 Senior Notes      
Extinguishment of Debt [Line Items]      
Debt Extinguished   88.9 136.7
Gain (loss) on extinguishment of debt   (3.3) (7.8)
$540 Million 8.25% 2020 First Lien Notes      
Extinguishment of Debt [Line Items]      
Debt Extinguished     540.0
Gain (loss) on extinguishment of debt     (93.5)
$218.5 Million 8.00% 2020 1.5 Lien Notes      
Extinguishment of Debt [Line Items]      
Debt Extinguished     218.5
Gain (loss) on extinguishment of debt     45.1
$544.2 Million 7.75% 2020 Second Lien Notes      
Extinguishment of Debt [Line Items]      
Debt Extinguished     430.1
Gain (loss) on extinguishment of debt     (104.5)
$500 Million 4.80% 2020 Senior Notes      
Extinguishment of Debt [Line Items]      
Debt Extinguished   122.4 114.4
Gain (loss) on extinguishment of debt   $ (3.7) $ (1.9)
$800 Million 6.25% 2040 Senior Notes [Member]      
Extinguishment of Debt [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 6.25%