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Notes Payable - General Narrative (Details) - Notes payable
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Oct. 31, 2020
GBP (£)
Debt        
Unamortized net original issuance premiums $ 14.6 $ 6.3    
Deferred financing costs $ 49.2 35.9    
Weighted average interest rate (as a percent) 3.40%      
Weighted average remaining years until maturity 8 years 2 months 12 days      
Interest incurred on notes and bonds $ 252.0 $ 233.5 $ 213.8  
1.625% notes, issued in October 2020 and due December 2030        
Debt        
Face amount of loan | £       £ 400,000,000
Interest rate (as a percent) 1.625%     1.625%
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%