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Subsequent Events (Details)
T in Millions
12 Months Ended
Jan. 21, 2016
USD ($)
factor
draw
Jan. 10, 2016
USD ($)
Dec. 31, 2015
USD ($)
T
Subsequent Event [Line Items]      
Account receivable securitization, program fees (percentage)     2.65%
Subsequent Event [Member]      
Subsequent Event [Line Items]      
Holder's of first lien term loan, percentage   50.00%  
Stock outstanding, subject to dilution, percentage   100.00%  
Reduction to long term debt   $ 4,500,000,000  
Securitized account receivable $ 200,000,000    
Number of factors required to determine cost of advance backstopping a letter of credit issued under the securitization facility | factor 2    
DIP, amount arranged $ 275,000,000    
DIP, amount arranged, number of withdrawals allowed | draw 2    
DIP, amount arranged, period of availability (in months) 6 months    
DIP, carve-out for claims $ 75,000,000    
DIP, financial maintenance covenant, prior to entry of final order 300,000,000    
DIP, financial maintenance covenant, following the entry of final order 500,000,000    
DIP, customary prepayments, proceeds from sale or disposition of non-ordinary course asset 50,000,000    
DIP, Customary Prepayments, Proceeds from Sale or Disposition of Non-Ordinary Course Asset, Individual Sale, Maximum 7,500,000    
DIP, Customary prepayments, proceeds from any casualty event $ 50,000,000    
Base Rate [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Basis of variable spread (in percentage) 8.00%    
LLIBOR [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Basis of variable spread (in percentage) 9.00%    
7.00% Senior Notes Due 2019 [Member]      
Subsequent Event [Line Items]      
Senior notes interest rate     7.00%
9.875% Senior Notes Due 2019 [Member]      
Subsequent Event [Line Items]      
Senior notes interest rate     9.875%
8.00% Senior Secured Notes due 2019 [Member]      
Subsequent Event [Line Items]      
Senior notes interest rate     8.00%
7.25% Senior Notes Due 2020 [Member]      
Subsequent Event [Line Items]      
Senior notes interest rate     7.25%
7.25% Senior Notes Due 2021 [Member]      
Subsequent Event [Line Items]      
Senior notes interest rate     7.25%
Amount to be settled in cash     $ 326,500,000
Interest Rate Floor [Member] | LLIBOR [Member] | Subsequent Event [Member]      
Subsequent Event [Line Items]      
Basis of variable spread (in percentage) 1.00%    
Kentucky [Member]      
Subsequent Event [Line Items]      
Net book value of idled facility     $ 66,800,000
Amount of reserves (tons) | T     22.0