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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Loss Contingencies [Line Items]    
Funded loans unpaid principal $ 35,200.0  
Letters of credit outstanding 159.1  
Accrued loan loss 64.0 $ 57.1
Assets available for recourse 1,100.0  
Guarantees total $ 50.9  
Co-investments typically range 2.00%  
Commitments to investment in future real estate investment $ 127.1  
Commitments to investment in unconsolidated real estate subsidiary 40.7  
Commitment to investment in consolidated projects 141.6  
COVID-19 Pandemic    
Loss Contingencies [Line Items]    
Advances for principal and interest 9.3  
Warehouse Receivable    
Loss Contingencies [Line Items]    
Warehouse receivables 611.3  
Funded loans subject to loss sharing arrangements    
Loss Contingencies [Line Items]    
Funded loans unpaid principal 31,200.0  
Letters of credit outstanding 100.0 95.0
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 $ 105.0