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Long-Term Debt - Credit Facility (Details) - USD ($)
12 Months Ended
May 31, 2018
Jul. 26, 2017
Oct. 27, 2014
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Line of Credit Facility [Line Items]            
Debt issuance costs   $ 5,000,000        
Accelerated amortization of debt issuance costs $ 6,000,000 6,000,000   $ 1,000,000 $ 65,000,000 $ 0
A&R Credit Agreement | LIBOR            
Line of Credit Facility [Line Items]            
Index rate spread (as a percent) 1.75%   2.00%      
Senior Notes            
Line of Credit Facility [Line Items]            
Accelerated amortization of debt issuance costs         16,000,000  
Outstanding principal redeemed         1,100,000,000  
Make whole premium         $ 65,000,000  
Loans Payable | Term Loan A            
Line of Credit Facility [Line Items]            
Revolving credit facility maximum borrowing capacity   670,000,000        
Debt issuance costs, one time pretax charges $ 2,000,000          
Percentage bearing variable interest, percentage rate       3.84%    
Loans Payable | Term Loan B            
Line of Credit Facility [Line Items]            
Extinguishment of debt 300,000,000          
Debt issuance costs, one time pretax charges 1,000,000          
Percentage bearing variable interest, percentage rate       4.09%    
Revolving Credit Agreement            
Line of Credit Facility [Line Items]            
Revolving credit facility maximum borrowing capacity   $ 500,000,000        
Letters of credit       $ 5,000,000    
Funds available for other borrowings       $ 795,000,000    
Revolving credit facility interest rate       3.26%    
Revolving Credit Agreement | A&R Credit Agreement            
Line of Credit Facility [Line Items]            
Revolving credit facility maximum borrowing capacity $ 800,000,000