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Debt - Bank Line of Credit and Term Loan (Details)
£ in Millions
3 Months Ended
Apr. 06, 2018
USD ($)
Mar. 31, 2018
USD ($)
renewal_option
Mar. 31, 2017
USD ($)
Mar. 31, 2018
GBP (£)
renewal_option
Dec. 31, 2017
USD ($)
Debt Instrument          
Bank line of credit   $ 1,092,357,000     $ 1,017,076,000
Repayment under bank line of credit   170,000,000 $ 37,032,000    
Debt   7,871,735,000      
Outstanding balance on term loan   $ 236,878,000     $ 228,288,000
Line of Credit and Term Loan          
Debt Instrument          
Debt instrument, covenant debt to assets (as a percent)   60.00%   60.00%  
Debt instrument, covenant secured debt to assets (as a percent)   30.00%   30.00%  
Debt instrument, covenant unsecured debt to unencumbered assets (as a percent)   60.00%   60.00%  
Debt instrument, covenant minimum fixed charge coverage ratio   1.5   1.5  
Debt instrument, covenant net worth   $ 6,500,000,000.0      
2015 Term Loan          
Debt Instrument          
Length of debt instrument extension period   1 year      
Outstanding balance on term loan   $ 237,000,000   £ 169  
GBP LIBOR | 2015 Term Loan          
Debt Instrument          
Debt instrument, basis spread on variable rate (as a percent)   1.15%      
Bank Line of Credit | Revolving Credit Facility          
Debt Instrument          
Line of credit facility, maximum borrowing capacity   $ 2,000,000,000.0      
Number of extensions | renewal_option   2   2  
Length of debt instrument extension period   6 months      
Debt instrument, facility fee (as a percent)   0.20%      
Line of credit facility additional aggregate amount, maximum   $ 750,000,000      
Bank line of credit   1,100,000,000      
Debt denominated in foreign currency outstanding   $ 147,000,000   £ 105  
Weighted-average interest rate (as a percent)   2.99%   2.99%  
Bank Line of Credit | Revolving Credit Facility | Subsequent Event          
Debt Instrument          
Repayment under bank line of credit $ 290,000,000        
Bank Line of Credit | Revolving Credit Facility | LIBOR          
Debt Instrument          
Debt instrument, basis spread on variable rate (as a percent)   1.00%