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Debt - Bank Line of Credit and Term Loan (Details)
£ in Millions
1 Months Ended 3 Months Ended
Jul. 03, 2018
USD ($)
Jul. 03, 2018
GBP (£)
Nov. 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
renewal_option
Mar. 31, 2018
USD ($)
Mar. 31, 2019
GBP (£)
renewal_option
Dec. 31, 2018
USD ($)
Debt Instrument              
Bank line of credit       $ 276,500,000     $ 80,103,000
Repayment under bank line of credit       $ 125,000,000 $ 170,000,000    
Term loan             $ 0
2015 Term Loan              
Debt Instrument              
Repayment under bank line of credit | £   £ 169          
Repayments of debt     $ 224,000,000        
2018 term loan              
Debt Instrument              
Issuance and borrowings of debt, excluding bank line of credit $ 224,000,000            
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      
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)       0.15%      
Line of credit facility additional aggregate amount, maximum       $ 750,000,000      
Bank line of credit       277,000,000      
Debt denominated in foreign currency outstanding       $ 72,000,000   £ 55  
Weighted-average interest rate (as a percent)       3.20%   3.20%  
Bank Line of Credit | Revolving Credit Facility | LIBOR              
Debt Instrument              
Debt instrument, basis spread on variable rate (as a percent)       0.875%