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Securitizations and Variable Interests Entities - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Servicing Assets at Fair Value [Line Items]      
Average period to securitization 30 days    
Ginnie Mae      
Servicing Assets at Fair Value [Line Items]      
Percentage of transferred residential loans serviced 60 days or more past due 12.00% 17.10%  
Forward Loans      
Servicing Assets at Fair Value [Line Items]      
MSRs retained $ 222.7 $ 68.7 $ 7.5
Percentage of transferred residential loans serviced 60 days or more past due 3.60% 6.80%