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Debt Debt Schedule (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2016
May 18, 2016
Apr. 18, 2016
Apr. 15, 2016
Apr. 13, 2016
Mar. 31, 2016
Debt Instrument [Line Items]                          
Debt Instrument, Unamortized Discount (Premium), Net $ 89.0     $ 89.0 $ 89.0                
Loss on early debt extinguishment (29.5) $ 8.3 $ 59.5 (29.5) 29.5 $ 67.8 $ 1.6            
Capital lease obligations 19.7     19.7 19.7 30.3              
Other long-term debt 0.4     0.4 0.4 0.7              
Liabilities Subject to Compromise 8,440.2     8,440.2 8,440.2 0.0              
Long-term Debt and Capital Lease Obligations, Current 20.2     20.2 20.2 5,874.9              
Long-term Debt and Capital Lease Obligations 0.0     0.0 0.0 366.3              
Contractual interest expense         564.9                
Interest Expense, Stayed Amount         266.3                
DIP Facility - Bonding Accommodation Facility [Member]                          
Debt Instrument [Line Items]                          
Long-term Debt                     $ 200.0 $ 200.0  
DIP Credit Agreement [Member]                          
Debt Instrument [Line Items]                          
Aggregate Letters of Credit, Maximum                       50.0  
Revolving Credit Facility [Member]                          
Debt Instrument [Line Items]                          
Long-term Debt 1,558.1     1,558.1 1,558.1 0.0             $ 947.0
Exit facility, maximum borrowing capacity 1,650.0     1,650.0 1,650.0                
Letters of Credit Outstanding, Amount $ 611.0     $ 611.0 $ 611.0             675.0  
Term Loan Facility [Member]                          
Debt Instrument [Line Items]                          
Stated interest rate - percentage 4.50%     4.50% 4.50%                
Exit facility, maximum borrowing capacity $ 950.0     $ 950.0 $ 950.0                
2013 Term Loan Facility [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Outstanding Principal 1,170.0     1,170.0 1,170.0                
Long-term Debt 1,154.5     1,154.5 1,154.5 1,156.3              
Exit facility, maximum borrowing capacity $ 1,200.0     $ 1,200.0 $ 1,200.0                
7.375% Senior Notes due November 2016 [Member]                          
Debt Instrument [Line Items]                          
Stated interest rate - percentage 7.375%     7.375% 7.375%                
Loss on early debt extinguishment         $ 67.8                
Write-off of debt issuance costs         $ 1.4                
6.00% Senior Notes due November 2018 [Member]                          
Debt Instrument [Line Items]                          
Stated interest rate - percentage 6.00%     6.00% 6.00%                
Debt Instrument, Outstanding Principal $ 1,518.8     $ 1,518.8 $ 1,518.8                
Long-term Debt $ 1,509.9     $ 1,509.9 $ 1,509.9 1,508.9              
6.50% Senior Notes due September 2020 [Member]                          
Debt Instrument [Line Items]                          
Stated interest rate - percentage 6.50%     6.50% 6.50%     6.50%          
Debt Instrument, Outstanding Principal $ 650.0     $ 650.0 $ 650.0                
Long-term Debt $ 645.8     $ 645.8 $ 645.8 645.5              
6.25% Senior Notes due November 2021 [Member]                          
Debt Instrument [Line Items]                          
Stated interest rate - percentage 6.25%     6.25% 6.25%     6.25%          
Debt Instrument, Outstanding Principal $ 1,339.6     $ 1,339.6 $ 1,339.6                
Long-term Debt $ 1,327.7     $ 1,327.7 $ 1,327.7 1,327.0              
10.00% Senior Secured Second Lien Notes Due 2022 [Member]                          
Debt Instrument [Line Items]                          
Stated interest rate - percentage 10.00%     10.00% 10.00%                
Debt Instrument, Outstanding Principal $ 1,000.0     $ 1,000.0 $ 1,000.0                
Long-term Debt 962.3     962.3 962.3 960.4              
Face amount of senior notes $ 1,000.0     $ 1,000.0 $ 1,000.0                
7.875% Senior Notes due November 2026 [Member]                          
Debt Instrument [Line Items]                          
Stated interest rate - percentage 7.875%     7.875% 7.875%     7.875%          
Debt Instrument, Outstanding Principal $ 250.0     $ 250.0 $ 250.0                
Long-term Debt 245.9     245.9 245.9 245.8              
Convertible Junior Subordinated Debentures [Member]                          
Debt Instrument [Line Items]                          
Debt Instrument, Outstanding Principal 732.5     732.5 732.5                
Long-term Debt 367.1     367.1 367.1 366.3              
Long-term Debt [Member]                          
Debt Instrument [Line Items]                          
Liabilities Subject to Compromise 7,771.2     7,771.2 7,771.2 0.0              
DIP Facility - Term Loan [Member]                          
Debt Instrument [Line Items]                          
Long-term Debt                       500.0  
DIP Facility - Initially Available [Member]                          
Debt Instrument [Line Items]                          
Long-term Debt                   $ 200.0 200.0 200.0  
DIP Facility - Remaining Availability [Member]                          
Debt Instrument [Line Items]                          
Long-term Debt                 $ 300.0     300.0  
DIP Term Loan Facility [Member]                          
Debt Instrument [Line Items]                          
Debt Issuance Cost $ 26.8     $ 26.8 26.8                
Loss on early debt extinguishment         $ (29.5)                
Early Repayment of DIP Financing         10                
Write-off of debt issuance costs         $ 19.5                
DIP Facility - Letter of Credit [Member]                          
Debt Instrument [Line Items]                          
Letters of Credit Outstanding, Amount                     $ 100.0 $ 100.0  
6.000% Senior Secured Notes Due 2022 [Member]                          
Debt Instrument [Line Items]                          
Stated interest rate - percentage 6.00%     6.00% 6.00%                
Face amount of senior notes $ 500.0     $ 500.0 $ 500.0                
6.375% Senior Secured Notes Due 2025 [Member]                          
Debt Instrument [Line Items]                          
Stated interest rate - percentage 6.375%     6.375% 6.375%                
Face amount of senior notes $ 500.0     $ 500.0 $ 500.0                
Reported Value Measurement [Member]                          
Debt Instrument [Line Items]                          
Debt and capital lease obligations $ 7,791.4     $ 7,791.4 $ 7,791.4 $ 6,241.2              
Eurocurrency Rate [Member] | Term Loan Facility [Member]                          
Debt Instrument [Line Items]                          
Debt instrument, basis spread on variable rate         1.00%