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Long-Term Debt - Credit Agreement (Details) - USD ($)
$ in Millions
6 Months Ended
Dec. 16, 2014
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Debt Instrument [Line Items]        
Principal payments on long-term debt     $ 11.0  
Outstanding letter of credit amount   $ 14.3   $ 7.7
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   $ 10.0   $ 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 prime (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%      
Debt, interest rate   4.50%    
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 300 basis points (LIBOR shall not be less than 75 basis points per annum) or ABR (as defined therein) plus 200 basis points    
Aggregate principal amount $ 2,200.0      
Term Loan Facility | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Basis spread percentage 3.00%      
Term Loan Facility | Prime Rate        
Debt Instrument [Line Items]        
Basis spread percentage 2.00%      
Debt, interest rate   3.75%    
Covenant Requirement | Minimum        
Debt Instrument [Line Items]        
Interest coverage ratio   300.00%    
Covenant Requirement | Maximum        
Debt Instrument [Line Items]        
Total leverage ratio   450.00%