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Securitizations and Variable Interest Entities - Schedule of Carrying Value of Assets and Liabilities of Loans Held for Sale Financing Facility (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]        
Loans held for sale, at fair value $ 617.8 $ 917.5 $ 366.4 $ 208.8
Master Repurchase Agreement | Secured Debt        
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]        
Outstanding borrowings (Mortgage loan warehouse facilities) 0.0 459.3    
Variable Interest Entity, Primary Beneficiary        
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]        
Loans held for sale, at fair value $ 0.0 $ 462.1