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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Loss Contingencies [Line Items]    
Funded loans unpaid principal $ 41,500.0  
Letters of credit outstanding 236.9  
Accrued loan loss 67.4 $ 65.1
Assets available for recourse 651.7  
Guarantees total $ 206.2  
Co-investments typically range 2.00%  
Commitments to investment in future real estate investment $ 180.4  
Maximum Future Commitments Equity In Real Estate Investment, Percent 0.50  
Commitment to investment in consolidated projects $ 230.1  
Commitments to investment in unconsolidated real estate subsidiary 73.9  
Warehouse Receivable    
Loss Contingencies [Line Items]    
Warehouse receivables 215.1  
Funded loans subject to loss sharing arrangements    
Loss Contingencies [Line Items]    
Funded loans unpaid principal 38,000.0  
Letters of credit outstanding 140.0 113.0
SBL Program    
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 5.0 $ 5.0
Percentage of maximum original principal amount loan loss 10.00%  
Funded loans not subject to loss sharing arrangements    
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 145.0