Annual report pursuant to Section 13 and 15(d)

DEBT AND CREDIT FACILITIES (Debt Extinguishment/Restructuring) (Details)

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DEBT AND CREDIT FACILITIES (Debt Extinguishment/Restructuring) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Extinguishment of Debt [Line Items]        
Gain (loss) on extinguishment of debt   $ (6.8) $ (165.4) $ 166.3
$544.2 Million 7.75% 2020 Second Lien Notes        
Extinguishment of Debt [Line Items]        
Debt Instrument, Face Amount Exchanged       114.1
Debt Instrument, Face Amount Received in Debt Exchange of $544M 7.75% Notes       57.0
Debt, carrying value       77.5
Gain (loss) on extinguishment of debt     (104.5) 6.9
$500 Million 3.95% 2018 Senior Notes [Member]        
Extinguishment of Debt [Line Items]        
Debt Instrument, Face Amount Exchanged       17.6
Debt Instrument, Face Amount Received in Debt Exchange of $500M 3.95% Notes       11.4
Debt, carrying value       15.5
Gain (loss) on extinguishment of debt $ 19.9     1.8
$400 Million 5.90% 2020 Senior Notes        
Extinguishment of Debt [Line Items]        
Debt Instrument, Face Amount Exchanged       65.1
Debt Instrument, Face Amount Received in Debt Exchange of $400M 5.90% Notes       26.0
Debt Instrument, Par Value     88.9  
Debt, carrying value       35.4
Gain (loss) on extinguishment of debt   (3.3) (7.8) 28.3
$500 Million 4.80% 2020 Senior Notes        
Extinguishment of Debt [Line Items]        
Debt Instrument, Face Amount Exchanged       44.7
Debt Instrument, Face Amount Received in Debt Exchange of $500M 4.80% Notes       17.9
Debt Instrument, Par Value     122.4  
Debt, carrying value       24.4
Gain (loss) on extinguishment of debt   (3.7) (1.9) 19.5
$700 Million 4.875% 2021 Senior Notes        
Extinguishment of Debt [Line Items]        
Debt Instrument, Face Amount Exchanged       76.3
Debt instrument, Face Amount Received in Debt Exchange of $700M 4.875% Notes       30.5
Debt Instrument, Par Value   124.0 138.4  
Debt, carrying value       41.5
Gain (loss) on extinguishment of debt   0.1 (2.8) 33.3
$800 Million 6.25% 2040 Senior Notes [Member]        
Extinguishment of Debt [Line Items]        
Debt Instrument, Face Amount Exchanged       194.4
Debt Instrument, Face Amount Received in Debt Exchange of $800M 6.25% Notes       75.7
Debt Instrument, Par Value   $ 298.4 298.4  
Debt, carrying value       103.0
Gain (loss) on extinguishment of debt       84.5
$218.5 Million 8.00% 2020 1.5 Lien Notes        
Extinguishment of Debt [Line Items]        
Debt Instrument, Face Amount Exchanged       512.2
Debt Instrument, Par Value       218.5
Debt, carrying value       297.3
Gain (loss) on extinguishment of debt     $ 45.1 $ 174.3