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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Loss Contingencies [Line Items]    
Letters of credit outstanding $ 154.5  
Accrued loan loss 57.1 $ 37.0
Assets available for recourse 1,100.0  
Guarantees total $ 42.1  
Co-investments typically range 2.00%  
Commitments to investment in future real estate investment $ 76.5  
Commitments to investment in unconsolidated real estate subsidiary 34.8  
COVID-19 Pandemic    
Loss Contingencies [Line Items]    
Advances for principal and interest 7.0  
Reimbursement of advances for principle and interest 5.3  
Warehouse Receivable    
Loss Contingencies [Line Items]    
Warehouse receivables 694.4  
Funded loans subject to loss sharing arrangements    
Loss Contingencies [Line Items]    
Funded loans unpaid principal 32,700.0  
Letters of credit outstanding 95.0 72.0
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 $ 100.0