Quarterly report pursuant to Section 13 or 15(d)

DEBT AND CREDIT FACILITIES DEBT AND CREDIT FACILITIES (Narrative) (Details)

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DEBT AND CREDIT FACILITIES DEBT AND CREDIT FACILITIES (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]        
Debt Instrument, Par Value   $ 2,238.0    
Extinguishment of Debt, Amount $ 1.0 724.0 $ 16.5  
$750 Million 5.875% 2027 Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Par Value   $ 750.0    
Debt issuance, discount rate   96.125%    
Debt Instrument, Interest Rate, Stated Percentage   5.875%    
Repurchase price if triggering event occurs   101.00%    
Debt Issuance Costs, Gross   $ 6.8    
$1.075 Billion 5.75% 2025 Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Par Value   473.3   $ 1,073.3
Extinguishment of Debt, Amount $ 0.0 $ 600.0 $ 1.7