Annual report pursuant to Section 13 and 15(d)

DEBT AND CREDIT FACILITIES (Narrative) (Details)

v3.8.0.1
DEBT AND CREDIT FACILITIES (Narrative) (Details)
$ / shares in Units, shares in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
shares
Mar. 31, 2017
USD ($)
shares
Mar. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
Dec. 19, 2017
USD ($)
Feb. 09, 2017
$ / shares
Sep. 16, 2016
USD ($)
Aug. 10, 2016
$ / shares
Line of Credit Facility [Line Items]                        
Extinguishment of Debt, Amount           $ 1,610,700,000            
Common shares, par value | $ / shares $ 0.125         $ 0.125 $ 0.125          
Common Stock, New Shares, Issued | shares   44,400 63,250                  
Net proceeds from issuance of common shares         $ 287,600,000 $ 661,300,000 $ 287,400,000 $ 0        
Shares Issued, Price Per Share | $ / shares                   $ 10.75   $ 6.75
Gain on extinguishment/restructuring of debt       $ (174,300,000)   165,400,000 (166,300,000) (392,900,000)        
Debt redemption premiums paid           110,000,000 17,400,000          
Debt issuance costs           28,600,000 5,200,000 $ 33,600,000        
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature           $ 83,400,000            
Long-term Debt, Current Maturities             17,500,000          
Common Shares Issued in Debt to Equity Exchange | shares 8,200         8,200            
Debt Instrument, Face Amount Exchanged             $ 512,200,000          
$1.075 Billion 5.75% 2025 Senior Notes [Member]                        
Line of Credit Facility [Line Items]                        
Proceeds from Issuance of Debt   $ 575,000,000 $ 500,000,000                  
Imputed interest rate 6.01%         6.01%            
Redemption Price of 35 percent or less of Outstanding           1.0575            
Debt Instrument, Interest Rate, Stated Percentage 5.75%         5.75%            
Debt issuance, discount rate 97.00%         97.00%            
Repurchase price if triggering event occurs           1.01            
In the Event of Default Amount that will Accelerate           0.25            
Debt Instrument, Par Value $ 1,075,000,000         $ 1,075,000,000            
Note Redemption Price, Percent of Principal Amount to be Redeemed 100.00%         100.00%            
Amount in aggregate that can be redeemed on or prior to March 1, 2020           0.3500            
Debt issuance costs           $ 12,400,000            
Unamortized Debt Issuance Expense $ 11,300,000         11,300,000            
Debt Instrument, Unamortized Discount 16,500,000         $ 16,500,000            
$400 Million 4.875% 2024 Senior Notes [Domain]                        
Line of Credit Facility [Line Items]                        
Proceeds from Issuance of Debt $ 400,000,000                      
Imputed interest rate 5.00%         5.00%            
Redemption Price of 35 percent or less of Outstanding           1.0488            
Amount to Remain Outstanding Prior to March 31, 2018           0.6500            
Debt Instrument, Interest Rate, Stated Percentage 4.875%         4.875%            
Debt issuance, discount rate 99.00%         99.00%            
Repurchase price if triggering event occurs           1.01            
Initial Redemption Price           1.02438            
In the Event of Default Amount that will Accelerate           0.25            
Debt Instrument, Par Value $ 400,000,000         $ 400,000,000            
Note Redemption Price, Percent of Principal Amount to be Redeemed 100.00%         100.00%            
Redemption amount prior to January 15, 2021           10.00%            
Secondary Redemption Price           1.03            
Amount in aggregate that can be redeemed on or prior to March 31, 2018           0.3500            
Unamortized Debt Issuance Expense $ 7,100,000         $ 7,100,000            
Debt Instrument, Unamortized Discount 2,600,000         $ 2,600,000            
$316 Million 1.5% 2025 Senior Notes [Domain]                        
Line of Credit Facility [Line Items]                        
Proceeds from Issuance of Debt $ 316,300,000                      
Imputed interest rate 6.26%         6.26%            
Convertible debt, initial conversion price $ 8.17         $ 8.17            
Convertible debt, common shares exchanged $ 122.4365         $ 122.4365            
Common shares, par value | $ / shares $ 0.125         $ 0.125            
Convertible debt, principal increment $ 1,000         $ 1,000            
Debt Instrument, Interest Rate, Stated Percentage 1.50%         1.50%            
Debt Instrument, Par Value $ 316,300,000         $ 316,300,000            
Note Redemption Price, Percent of Principal Amount to be Redeemed 100.00%         100.00%            
Unamortized Debt Issuance Expense $ 6,600,000         $ 6,600,000     $ 9,100,000      
Debt Instrument, Unamortized Discount 85,600,000         85,600,000            
Adjustments to Additional Paid in Capital, Convertible Debt with Conversion Feature           83,400,000            
Debt issuance costs to APIC           2,500,000            
$316 Million 1.5% 2025 Senior Notes [Domain] | Maximum [Member]                        
Line of Credit Facility [Line Items]                        
Convertible debt, conversion price percentage 0.98         0.98            
$316 Million 1.5% 2025 Senior Notes [Domain] | Minimum [Member]                        
Line of Credit Facility [Line Items]                        
Convertible debt, conversion price percentage $ 1.30         1.30            
$540 Million 8.25% 2020 First Lien Notes [Member]                        
Line of Credit Facility [Line Items]                        
Imputed interest rate             9.97%          
Extinguishment of Debt, Amount     $ 35,600,000     540,000,000            
Debt Instrument, Par Value             $ 540,000,000          
Gain on extinguishment/restructuring of debt           $ 93,500,000            
Unamortized Debt Issuance Expense             8,000,000          
Debt Instrument, Unamortized Discount             25,700,000          
$218.5 Million 8.00% 2020 1.5 Lien Notes [Member]                        
Line of Credit Facility [Line Items]                        
Imputed interest rate 8.00%         8.00%            
Extinguishment of Debt, Amount           $ 218,500,000            
Debt Instrument, Par Value             218,500,000          
Gain on extinguishment/restructuring of debt           (45,100,000)            
Unamortized Debt Issuance Expense             0          
Debt Instrument, Unamortized Discount             $ 65,700,000          
$544.2 Million 7.75% 2020 Second Lien Notes [Member]                        
Line of Credit Facility [Line Items]                        
Imputed interest rate             15.55%          
Extinguishment of Debt, Amount           430,100,000            
Debt Instrument, Par Value             $ 430,100,000          
Gain on extinguishment/restructuring of debt           104,500,000 (6,900,000)          
Unamortized Debt Issuance Expense             5,800,000          
Debt Instrument, Unamortized Discount             85,200,000          
Debt Instrument, Face Amount Exchanged             114,100,000          
Secured Debt [Member]                        
Line of Credit Facility [Line Items]                        
Extinguishment of Debt, Amount           $ 648,600,000            
$500 Million 3.95% 2018 Senior Notes [Member]                        
Line of Credit Facility [Line Items]                        
Debt Instrument, Interest Rate, Stated Percentage 3.95%         3.95%            
Gain on extinguishment/restructuring of debt $ (19,900,000)           (1,800,000)          
Debt Instrument, Face Amount Exchanged             $ 17,600,000          
$400 Million 5.90% 2020 Senior Notes [Member]                        
Line of Credit Facility [Line Items]                        
Imputed interest rate 5.98%         5.98% 5.98%          
Extinguishment of Debt, Amount           $ 136,700,000            
Debt Instrument, Par Value $ 88,900,000         88,900,000 $ 225,600,000          
Gain on extinguishment/restructuring of debt           $ 7,800,000 (28,300,000)          
Basis points 35         35            
Unamortized Debt Issuance Expense $ 200,000         $ 200,000 600,000          
Debt Instrument, Unamortized Discount $ 100,000         $ 100,000 500,000          
Debt Instrument, Face Amount Exchanged             $ 65,100,000          
$500 Million 4.80% 2020 Senior Notes[Member]                        
Line of Credit Facility [Line Items]                        
Imputed interest rate 4.83%         4.83% 4.83%          
Extinguishment of Debt, Amount           $ 114,400,000            
Debt Instrument, Interest Rate, Stated Percentage 4.80%         4.80%            
Debt Instrument, Par Value $ 122,400,000         $ 122,400,000 $ 236,800,000          
Gain on extinguishment/restructuring of debt (600,000)         1,900,000 (19,500,000)          
Debt Redemption Expenses 2,500,000                      
Unamortized Debt Issuance Expense 300,000         300,000 700,000          
Debt Instrument, Unamortized Discount $ 100,000         $ 100,000 200,000          
Debt Instrument, Face Amount Exchanged             $ 44,700,000          
$700 Million 4.875% 2021 Senior Notes[Member]                        
Line of Credit Facility [Line Items]                        
Imputed interest rate 4.89%         4.89% 4.89%          
Extinguishment of Debt, Amount           $ 171,000,000            
Debt Instrument, Interest Rate, Stated Percentage 4.875%         4.875%            
Debt Instrument, Par Value $ 138,400,000         $ 138,400,000 $ 309,400,000          
Gain on extinguishment/restructuring of debt           $ 2,800,000 (33,300,000)          
Basis points 25         25            
Unamortized Debt Issuance Expense $ 300,000         $ 300,000 1,000,000          
Debt Instrument, Unamortized Discount $ 100,000         $ 100,000 200,000          
Debt Instrument, Face Amount Exchanged             $ 76,300,000          
$800 Million 6.25% 2040 Senior Notes [Member]                        
Line of Credit Facility [Line Items]                        
Imputed interest rate 6.34%         6.34% 6.34%          
Debt Instrument, Par Value $ 298,400,000         $ 298,400,000 $ 298,400,000          
Gain on extinguishment/restructuring of debt             (84,500,000)          
Basis points 40         40            
Unamortized Debt Issuance Expense $ 2,400,000         $ 2,400,000 2,500,000          
Debt Instrument, Unamortized Discount $ 3,400,000         3,400,000 3,400,000          
Debt Instrument, Face Amount Exchanged             194,400,000          
Unsecured Debt [Member]                        
Line of Credit Facility [Line Items]                        
Extinguishment of Debt, Amount           $ 422,200,000            
Repurchase price if triggering event occurs           1.01            
Note Redemption Price, Percent of Principal Amount to be Redeemed 100.00%         100.00%            
Unsecured Debt [Member] | Maximum [Member]                        
Line of Credit Facility [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 days            
Unsecured Debt [Member] | Minimum [Member]                        
Line of Credit Facility [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 days            
ABL Facility [Member]                        
Line of Credit Facility [Line Items]                        
Debt Instrument, Par Value $ 550,000,000         $ 550,000,000            
U.S. Tranche 450,000,000         450,000,000            
Sublimit for Issuers of Letters of Credit for U.S. Tranche 250,000,000         250,000,000            
Sublimit for U.S. Swingline Loans 100,000,000         100,000,000            
Australian Tranche 100,000,000         100,000,000            
Sublimit for Issuance of Letters of Credit for Australian Tranche 50,000,000         50,000,000            
Sublimit for Australian Swingline Loans 20,000,000         $ 20,000,000            
LIBOR Rate Based on a One-month interest period plus 1 percent           0.01            
Fixed Charge Coverage Ratio           1.0            
Credit facility, amount outstanding 0         $ 0 0          
Line of Credit Facility, Remaining Borrowing Capacity 226,700,000         226,700,000 227,000,000          
Revolving credit facility, borrowing capacity 273,200,000         $ 273,200,000 333,000,000          
ABL Facility [Member] | Maximum [Member]                        
Line of Credit Facility [Line Items]                        
Base Rate           0.01            
Letter of Credit [Member]                        
Line of Credit Facility [Line Items]                        
Credit facility, amount outstanding 46,500,000         $ 46,500,000 $ 106,000,000          
Debt Repurchase [Member] | $500 Million 3.95% 2018 Senior Notes [Member]                        
Line of Credit Facility [Line Items]                        
Redemption Price                     $ 301,000,000  
Debt Instrument, Par Value         283,600,000              
Debt Repurchase [Member] | $500 Million 4.80% 2020 Senior Notes[Member]                        
Line of Credit Facility [Line Items]                        
Debt Instrument, Par Value         $ 5,000,000              
Exchange of Debt for Equity [Member]                        
Line of Credit Facility [Line Items]                        
Gain on extinguishment/restructuring of debt (11,300,000)                      
Exchange of Debt for Equity [Member] | $218.5 Million 8.00% 2020 1.5 Lien Notes [Member]                        
Line of Credit Facility [Line Items]                        
Debt Instrument, Face Amount Exchanged 20,100,000         20,100,000            
Exchange of Debt for Equity [Member] | $500 Million 3.95% 2018 Senior Notes [Member]                        
Line of Credit Facility [Line Items]                        
Debt Instrument, Face Amount Exchanged 10,000,000         10,000,000            
Exchange of Debt for Equity [Member] | $700 Million 4.875% 2021 Senior Notes[Member]                        
Line of Credit Facility [Line Items]                        
Debt Instrument, Face Amount Exchanged 26,800,000         26,800,000            
Equity [Member] | $316 Million 1.5% 2025 Senior Notes [Domain]                        
Line of Credit Facility [Line Items]                        
Debt Instrument, Unamortized Discount $ 85,900,000         $ 85,900,000