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Debt (Amended senior secured credit facilities) (Details)
12 Months Ended
Jun. 26, 2014
USD ($)
Dec. 31, 2018
USD ($)
$ / shares
Feb. 21, 2014
USD ($)
Revolving Credit Facility      
Debt Instrument [Line Items]      
Assets pledged as collateral   $ 3,600,000,000  
Term Loan B | London Interbank Offered Rate (LIBOR)      
Debt Instrument [Line Items]      
Debt instrument, variable rate floor (as percent)   1.00%  
Variable rate basis on debt issuance   LIBOR  
Term Loan B | Revolving Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity   $ 100,000,000 $ 100,000,000
Long-term line of credit   50,000,000  
Line of credit facility, remaining borrowing capacity   $ 50,000,000  
Line of credit facility, commitment fee percentage (as percent)   0.50%  
Debt instrument, percentage increase in margin   3.00%  
Debt instrument, covenant, term loan prepayment   $ 120,800,000  
Quarterly distribution threshold (in dollars per share) | $ / shares   $ 0.10  
Net leverage ratio, during   4  
Net leverage ratio, beyond 2018   5  
Term Loan B | Revolving Credit Facility | Eurodollar      
Debt Instrument [Line Items]      
Basis spread (as percent)   2.25%  
Term Loan B | Term Loans      
Debt Instrument [Line Items]      
Maximum borrowing capacity     $ 1,800,000,000.0
Term Loan B | Term Loans | Eurodollar      
Debt Instrument [Line Items]      
Basis spread (as percent)   6.00%  
Additional Term Loans | Term Loans      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 1,100,000,000.0    
Debt instrument, periodic payment $ 29,000,000    
Line of Credit | Term Loan B      
Debt Instrument [Line Items]      
Long-term line of credit   $ 2,636,400,000