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Use of Special Purpose Entities (SPE) and Variable Interest Entities (VIE) - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Nov. 12, 2020
Dec. 31, 2019
VIE, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Fair value   $ 8.7  
Other Assets      
Variable Interest Entity [Line Items]      
Inventory, real estate, construction in process $ 0.0   $ 14.5
Residential Loans      
Variable Interest Entity [Line Items]      
Proceeds from issuance of securitized debt, net 540.4    
Non-Agency RMBS Re-Securitization      
Variable Interest Entity [Line Items]      
Proceeds from issuance of securitized debt, net $ 109.0    
RBDHC      
Variable Interest Entity [Line Items]      
Equity method investment, cumulative percentage ownership after all transactions 100.00%    
RBDHC | VIE, Primary Beneficiary      
Variable Interest Entity [Line Items]      
Variable interest entity, ownership percentage 50.00%