Annual report pursuant to Section 13 and 15(d)

DEBT AND CREDIT FACILITIES (Narrative) (Details)

v3.19.3.a.u2
DEBT AND CREDIT FACILITIES (Narrative) (Details)
$ / shares in Units, shares in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
$ / shares
Dec. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Debt Instrument [Line Items]      
Debt Instrument, Par Value $ 2,238,000,000.0    
Common shares, par value | $ / shares $ 0.125 $ 0.125  
Debt Extinguished $ 724,000,000.0 $ 227,400,000 $ 1,610,700,000
Net proceeds from issuance of common shares $ 0 0 $ 661,300,000
$400 Million 4.875% 2024 Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 4.875%    
Repurchase price if triggering event occurs 101.00%    
Debt Instrument, Par Value $ 400,000,000.0 400,000,000.0  
$316.25 Million 1.50% 2025 Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 1.50%    
Debt Instrument, Par Value $ 316,300,000 $ 316,300,000  
Common shares, par value | $ / shares $ 0.125    
Debt Instrument, Convertible, Threshold Trading Days 20    
Debt Instrument, Convertible, Threshold Consecutive Trading Days 30    
Convertible debt, principal increment $ 1,000    
Convertible debt, initial conversion price | $ / shares $ 8.17    
Debt Instrument, Convertible, Conversion Ratio 126.3479 122.4365  
Debt Instrument, Redemption Price, Percentage 100.00%    
$316.25 Million 1.50% 2025 Senior Notes [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 130.00%    
$316.25 Million 1.50% 2025 Senior Notes [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger 98.00%    
$1.075 Billion 5.75% 2025 Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.75%    
Debt Instrument, Par Value $ 473,300,000 $ 1,073,300,000  
Debt Instrument, Redemption Price, Percentage 100.00%    
Amount in aggregate that can be redeemed on or prior to March 1, 2020 0.35    
Redemption Price of 35 percent or less of Outstanding 1.0575    
Debt Extinguished $ 600,000,000.0 1,700,000  
$750 Million 5.875% 2027 Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 5.875%    
Repurchase price if triggering event occurs 101.00%    
Debt Instrument, Par Value $ 750,000,000.0    
Debt issuance, discount rate 96.125%    
Debt Issuance Costs, Gross $ 6,800,000    
$800 Million 6.25% 2040 Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Interest Rate, Stated Percentage 6.25%    
Debt Instrument, Par Value $ 298,400,000 298,400,000  
Debt Instrument, Redemption Price, Percentage 100.00%    
Basis points 40    
$800 Million 6.25% 2040 Senior Notes [Member] | Minimum [Member]      
Debt Instrument [Line Items]      
Time Period During Which Senior Notes May Be Redeemed at Company's Option, Number of Days From When Prior Notice Sent to Holders 30 years    
$800 Million 6.25% 2040 Senior Notes [Member] | Maximum [Member]      
Debt Instrument [Line Items]      
Time Period During Which Senior Notes May Be Redeemed at Company's Option, Number of Days From When Prior Notice Sent to Holders 60 years    
ABL Facility [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Par Value $ 450,000,000.0 $ 450,000,000.0  
Sublimit for Issuers of Letters of Credit for U.S. Tranche 248,800,000    
Sublimit for U.S. Swingline Loans $ 100,000,000.0    
Fixed Charge Coverage Ratio 1.0    
Equity [Member] | $316.25 Million 1.50% 2025 Senior Notes [Member]      
Debt Instrument [Line Items]      
Convertible debt, equity component $ 85,900,000    
Federal Funds Rate [Member] | ABL Facility [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.50%    
London Interbank Offered Rate (LIBOR) [Member] | ABL Facility [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.00%    
Prime Rate [Member] | ABL Facility [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.00%    
Common Stock [Member]      
Debt Instrument [Line Items]      
Equity offering (in shares) | shares     63.3
Common stock, shares issued, price per share | $ / shares     $ 10.75