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Notes Payable - Narrative (Details) - Notes payable
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
GBP (£)
Jan. 31, 2022
GBP (£)
Dec. 31, 2021
USD ($)
Jul. 31, 2021
GBP (£)
Oct. 31, 2020
GBP (£)
Debt                  
Unamortized net premiums | $ $ 257.0   $ 257.0       $ 295.5    
Deferred financing costs | $ $ 58.7   $ 58.7       $ 53.1    
Weighted average interest rate (as a percent) 3.20%   3.20%   3.20%        
Weighted average remaining years until maturity     7 years 7 months 6 days            
Interest incurred on notes and bonds | $ $ 103.0 $ 62.7 $ 206.1 $ 125.9          
1.625% Notes due 2030                  
Debt                  
Principal amount         £ 400,000,000       £ 400,000,000
Interest rate (as a percent) 1.625%   1.625%   1.625%       0.01625%
1.125% Notes due 2027                  
Debt                  
Principal amount         £ 400,000,000     £ 400,000,000  
Interest rate (as a percent) 1.125%   1.125%   1.125%     0.01125%  
1.750% Notes due 2033                  
Debt                  
Principal amount         £ 350,000,000     £ 350,000,000  
Interest rate (as a percent) 1.75%   1.75%   1.75%     0.0175%  
1.875% Notes due 2027                  
Debt                  
Principal amount         £ 250,000,000 £ 250,000,000      
Interest rate (as a percent) 1.875%   1.875%   1.875% 0.01875%      
2.500% Notes due 2042                  
Debt                  
Principal amount         £ 250,000,000 £ 250,000,000      
Interest rate (as a percent) 2.50%   2.50%   2.50% 0.025%      
Maximum                  
Debt                  
Debt to total adjusted assets ratio (as a percent)     60.00%            
Secured debt to total adjusted assets ratio (as a percent)     40.00%            
Minimum                  
Debt                  
Debt service coverage ratio     1.5            
Total unencumbered assets as a percentage of outstanding unsecured debt     150.00%