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Commercial Mortgage, Subordinate Loans and Other Lending Assets, Net - Additional Information (Details)
£ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2020
USD ($)
Jan. 31, 2020
GBP (£)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2021
GBP (£)
Nov. 30, 2020
USD ($)
Nov. 30, 2020
GBP (£)
Financing Receivable, Allowance for Credit Loss [Line Items]                
Mortgage loans on real estate, commercial and consumer, percentage of portfolio     100.00% 100.00% 100.00%      
Decrease in general CECL allowance     $ 1,200,000          
Interest receivable     37,646,000   $ 40,559,000      
Amortized cost of loans in cost recovery     404,074,000 $ 373,500,000        
Interest received for loans in cost recovery     300,000 1,800,000        
Total carrying value, net     6,820,074,000 6,430,618,000 6,496,977,000      
Principal balance     6,856,509,000 6,488,891,000 6,535,079,000      
Specific CECL allowance     0 (150,000,000)        
Payment in kind interest     16,800,000 12,400,000        
Proceeds from pre-payment penalties or accelerated fees       200,000        
Past Due 90                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Amortized cost of loans in cost recovery     $ 774,800,000   711,900,000      
Past Due 30-59                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Principal balance         $ 19,000,000.0      
Urban Retail                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Mortgage loans on real estate, commercial and consumer, percentage of portfolio     11.50%   10.00%      
Total carrying value, net             $ 422,700,000 £ 309.2
Principal balance     $ 787,311,000   $ 655,456,000      
Sale of Mezzanine Loan                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Proceeds from sale of loan $ 81,300,000 £ 62.2            
Realized loss on investment       0        
Sale Of Mezzanine Loan Two                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Realized loss on investment       0        
Sale of Unfunded Commitment of Senior Mortgage                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Proceeds from sale of loan $ 65,300,000 £ 50.0            
Commercial Mortgage and Subordinated Portfolio Segment                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Total carrying value, net     140,800,000   136,100,000      
Principal balance     6,856,509,000   6,535,079,000      
Commercial Mortgage and Subordinated Portfolio Segment | Urban Retail                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Total carrying value, net     351,700,000     £ 255.2 $ 338,400,000 £ 247.5
Subordinate Mortgage Portfolio Segment                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Total carrying value, net [1]     1,065,816,000   1,045,893,000      
Payment in kind interest       $ 1,000,000.0 $ 800,000      
Maximum exposure to loss     $ 68,100,000          
Maximum exposure to loss, term     5 years 7 months 6 days          
Floating Rate Loan                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Mortgage loans on real estate, commercial and consumer, percentage of portfolio     95.00%   95.00%      
Mortgage, Amortized cost                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Amortized cost of loans in cost recovery     $ 375,813,000          
Principal balance     7,051,148,000   $ 6,728,424,000      
Urban Predevelopment - Miami, FL | Mortgage, Amortized cost                
Financing Receivable, Allowance for Credit Loss [Line Items]                
Amortized cost of loans in cost recovery     118,136,000          
Total carrying value, net     $ 180,500,000          
[1] Net of $211,435 and $213,102 CECL Allowances in 2021 and 2020, respectively, comprised of $175,000 Specific CECL Allowance and $36,435 and $38,102 General CECL Allowance, respectively.