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Loans Receivable - Schedule of fair values and risk ratings (Details)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
loan
Dec. 31, 2020
USD ($)
loan
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of Loans 28 27
Fair Value | $ $ 1,448.1 $ 1,562.6
Related Party    
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of loans collateralized by equity interests in real estate investments 2 2
Loans Receivable | Credit Concentration Risk    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Fair Value 100.00% 100.00%
A    
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of Loans 5 0
Fair Value | $ $ 298.9 $ 0.0
A | Loans Receivable | Credit Concentration Risk    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Fair Value 20.70% 0.00%
BBB    
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of Loans 5 1
Fair Value | $ $ 364.7 $ 69.6
BBB | Loans Receivable | Credit Concentration Risk    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Fair Value 25.20% 4.50%
BB    
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of Loans 11 10
Fair Value | $ $ 504.4 $ 444.6
BB | Loans Receivable | Credit Concentration Risk    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Fair Value 34.80% 28.50%
B    
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of Loans 3 11
Fair Value | $ $ 62.8 $ 758.2
B | Loans Receivable | Credit Concentration Risk    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Fair Value 4.30% 48.50%
C    
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of Loans 2 2
Fair Value | $ $ 147.9 $ 147.0
C | Loans Receivable | Credit Concentration Risk    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Fair Value 10.20% 9.40%
D    
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of Loans 0 1
Fair Value | $ $ 0.0 $ 73.8
D | Loans Receivable | Credit Concentration Risk    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Fair Value 0.00% 4.70%
NR    
Financing Receivable, Credit Quality Indicator [Line Items]    
Number of Loans 2 2
Fair Value | $ $ 69.4 $ 69.4
NR | Loans Receivable | Credit Concentration Risk    
Financing Receivable, Credit Quality Indicator [Line Items]    
% of Fair Value 4.80% 4.40%