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Notes Payable - Narrative (Details) - Notes payable
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Apr. 30, 2022
GBP (£)
Mar. 31, 2022
GBP (£)
Jan. 31, 2022
GBP (£)
Dec. 31, 2021
USD ($)
Jul. 31, 2021
GBP (£)
Oct. 31, 2020
GBP (£)
Debt                
Unamortized net premiums | $ $ 272.7         $ 295.5    
Deferred financing costs | $ $ 60.6         $ 53.1    
Weighted average interest rate (as a percent) 3.20%     3.20%        
Weighted average remaining years until maturity 7 years 8 months 12 days              
Interest incurred on notes and bonds | $ $ 103.1 $ 63.2            
1.625% Notes due 2030                
Debt                
Principal amount       £ 400,000,000       £ 400,000,000
Interest rate (as a percent) 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%     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%     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% 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% 0.025%      
Private placement agreement, April 2022 | Subsequent event                
Debt                
Principal amount     £ 600,000,000          
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%