Annual report pursuant to Section 13 and 15(d)

CAPITAL STOCK (Details)

v3.10.0.1
CAPITAL STOCK (Details)
 1 Months Ended 3 Months Ended 12 Months Ended
Feb. 01, 2016
shares
Mar. 31, 2018
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Nov. 26, 2018
USD ($)
Oct. 18, 2018
$ / shares
Feb. 09, 2017
$ / shares
shares
Aug. 10, 2016
$ / shares
shares
Class of Stock [Line Items]                    
Stock Repurchase Program, Authorized Amount             $ 200,000,000      
Stock Repurchased During Period, Shares | shares       5,400,000            
Repurchase of common shares       $ (47,500,000) $ 0 $ 0        
Stock Repurchase Program, Average Price | $ / shares       $ 8.78            
Stock Repurchase Program, Remaining Authorized Repurchase Amount       $ 152,700,000            
Dividends Payable       15,000,000            
Common Stock, New Shares, Issued | shares                 63,250,000 44,400,000
Shares Issued, Price Per Share | $ / shares                 $ 10.75 $ 6.75
Net proceeds from issuance of common shares       0 661,300,000 $ 287,400,000        
Debt Extinguished       $ 227,400,000 $ 1,610,700,000          
Trading Day Window Determining Number of Common Shares Issuable on Conversion 20                  
Common shares, issued (in shares) | shares       301,886,794 301,886,794          
Common Shares Issued in Debt to Equity Exchange | shares           8,200,000        
Gain (loss) on extinguishment/restructuring of debt       $ (6,800,000) $ (165,400,000) $ 166,300,000        
Common Stock [Member]                    
Class of Stock [Line Items]                    
Dividends payable, per share | $ / shares               $ 0.05    
Common shares, issued (in shares) | shares 26,500,000                  
Convertible Preferred Stock, Common Shares Issued Upon Conversion | shares 25,200,000                  
Convertible Preferred Stock, Common Shares Issued Upon Conversion in Lieu of Dividend | shares 1,300,000                  
Exchange of Debt for Equity [Member]                    
Class of Stock [Line Items]                    
Gain (loss) on extinguishment/restructuring of debt           11,300,000        
$500 Million 3.95% 2018 Senior Notes [Member]                    
Class of Stock [Line Items]                    
Debt Instrument, Face Amount Exchanged           $ 17,600,000        
Debt Instrument, Interest Rate, Stated Percentage           3.95%        
Gain (loss) on extinguishment/restructuring of debt     $ 19,900,000     $ 1,800,000        
$500 Million 3.95% 2018 Senior Notes [Member] | Exchange of Debt for Equity [Member]                    
Class of Stock [Line Items]                    
Debt Instrument, Face Amount Exchanged           10,000,000        
$218.5 Million 8.00% 2020 1.5 Lien Notes                    
Class of Stock [Line Items]                    
Debt Extinguished         $ 218,500,000          
Debt Instrument, Face Amount Exchanged           $ 512,200,000        
Debt Instrument, Interest Rate, Stated Percentage         8.00% 8.00%        
Gain (loss) on extinguishment/restructuring of debt         $ 45,100,000 $ 174,300,000        
$218.5 Million 8.00% 2020 1.5 Lien Notes | Exchange of Debt for Equity [Member]                    
Class of Stock [Line Items]                    
Debt Instrument, Face Amount Exchanged           20,100,000        
$544.2 Million 7.75% 2020 Second Lien Notes                    
Class of Stock [Line Items]                    
Debt Extinguished         $ 430,100,000          
Debt Instrument, Face Amount Exchanged           114,100,000        
Debt Instrument, Interest Rate, Stated Percentage         7.75%          
Gain (loss) on extinguishment/restructuring of debt         $ (104,500,000) 6,900,000        
$700 Million 4.875% 2021 Senior Notes                    
Class of Stock [Line Items]                    
Debt Extinguished       $ 14,400,000 $ 171,000,000          
Debt Instrument, Face Amount Exchanged           $ 76,300,000        
Debt Instrument, Interest Rate, Stated Percentage       4.875% 4.875% 4.875%        
Gain (loss) on extinguishment/restructuring of debt       $ 100,000 $ (2,800,000) $ 33,300,000        
$700 Million 4.875% 2021 Senior Notes | Exchange of Debt for Equity [Member]                    
Class of Stock [Line Items]                    
Debt Instrument, Face Amount Exchanged           26,800,000        
$1.075 Billion 5.75% 2025 Senior Notes [Member]                    
Class of Stock [Line Items]                    
Proceeds from Issuance of Debt   $ 500,000,000                
Debt Instrument, Interest Rate, Stated Percentage       5.75%            
Secured Debt [Member]                    
Class of Stock [Line Items]                    
Debt Extinguished       $ 648,600,000            
Unsecured Debt [Member]                    
Class of Stock [Line Items]                    
Debt Extinguished       422,200,000            
$540 Million 8.25% 2020 First Lien Notes                    
Class of Stock [Line Items]                    
Debt Extinguished   $ 35,600,000     $ 540,000,000          
Debt Instrument, Interest Rate, Stated Percentage         8.25%          
Gain (loss) on extinguishment/restructuring of debt         $ (93,500,000)          
$400 Million 5.90% 2020 Senior Notes                    
Class of Stock [Line Items]                    
Debt Extinguished       $ 88,900,000 $ 136,700,000          
Debt Instrument, Face Amount Exchanged           65,100,000        
Debt Instrument, Interest Rate, Stated Percentage       5.90% 5.90%          
Gain (loss) on extinguishment/restructuring of debt       $ (3,300,000) $ (7,800,000) 28,300,000        
$500 Million 4.80% 2020 Senior Notes                    
Class of Stock [Line Items]                    
Debt Extinguished       $ 122,400,000 $ 114,400,000          
Debt Instrument, Face Amount Exchanged           $ 44,700,000        
Debt Instrument, Interest Rate, Stated Percentage       4.80% 4.80% 4.80%        
Gain (loss) on extinguishment/restructuring of debt       $ (3,700,000) $ (1,900,000) $ 19,500,000