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Notes Payable - General Narrative (Details) - Notes payable
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 31, 2022
GBP (£)
Dec. 31, 2021
GBP (£)
Jul. 31, 2021
GBP (£)
Oct. 31, 2020
GBP (£)
Debt              
Unamortized net premiums | $ $ 295.5 $ 14.6          
Deferred financing costs | $ $ 53.1 49.2          
Weighted average interest rate (as a percent) 3.30%       3.30%    
Weighted average remaining years until maturity 7 years 8 months 12 days            
Interest incurred on notes and bonds | $ $ 286.4 $ 252.0 $ 233.5        
1.875% Notes due 2027 | Subsequent event              
Debt              
Principal amount       £ 250,000,000      
Interest rate (as a percent)       1.875%      
2.500% Notes due 2042 | Subsequent event              
Debt              
Principal amount       £ 250,000,000      
Interest rate (as a percent)       2.50%      
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%
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%  
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%  
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%