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Long-Term Debt (Details 2) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Dec. 16, 2014
Dec. 31, 2014
Sep. 30, 2015
Sep. 30, 2015
Debt Instrument [Line Items]        
Principal payments on long-term debt       $ 136.0
Loss on extinguishment of debt   $ 243.6   (0.9)
Outstanding letter of credit amount   7.7 $ 8.5 8.5
London Interbank Offered Rate (LIBOR) | Minimum        
Debt Instrument [Line Items]        
Debt, interest rate 0.75%      
Revolving Credit Facility        
Debt Instrument [Line Items]        
Debt instrument term 5 years      
Revolving credit facility $ 600.0      
Amount outstanding   0.0 0.0 $ 0.0
Revolving credit facility agreement       Borrowings under the Revolving Credit Facility bear interest at an annual rate equal to the London interbank offered rate ("LIBOR") plus 200 basis points or ABR (as defined therein) plus 100 basis points.
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread percentage 2.00%      
Revolving Credit Facility | Prime Rate        
Debt Instrument [Line Items]        
Basis spread percentage 1.00%      
Term Loan Facility        
Debt Instrument [Line Items]        
Debt instrument term 7 years      
Revolving credit facility agreement       Borrowings under the Term Loan Facility bear interest at an annual rate equal to LIBOR plus 325 basis points (LIBOR shall not be less than 75 basis points per annum) or ABR (as defined therein) plus 225 basis points
Aggregate principal amount $ 2,200.0      
Principal payments on long-term debt     $ 125.0  
Term Loan Facility | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread percentage 3.25%      
Term Loan Facility | Prime Rate        
Debt Instrument [Line Items]        
Basis spread percentage 2.25%      
Debt, interest rate       4.00%
Senior Unsecured Notes 5.25 Percent Due 2022        
Debt Instrument [Line Items]        
Principal payments on long-term debt   $ 1,300.0    
Interest rate (as a percent)   5.25%    
Senior Unsecured Notes 6.875 Percent Due 2020        
Debt Instrument [Line Items]        
Principal payments on long-term debt   $ 650.0    
Interest rate (as a percent)   6.875%    
Covenant Requirement | Minimum        
Debt Instrument [Line Items]        
Interest coverage ratio     300.00% 300.00%
Covenant Requirement | Maximum        
Debt Instrument [Line Items]        
Total leverage ratio     525.00%