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Securitizations and Variable Interest Entities - Schedule Of Carrying Value and Classification of Assets and Liabilities of Advance Financing Facilities (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Debt service accounts $ 37.2   $ 21.5
Advance match funded liabilities 440.2 $ 499.7  
Variable Interest Entity, Primary Beneficiary      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Advance match funded liabilities 439.5 498.9  
Variable Interest Entity, Primary Beneficiary | Advance match funded liabilities      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Match funded advances (Advances, net) 506.5 573.0  
Debt service accounts 11.7 15.7  
Advance match funded liabilities $ 439.5 $ 498.9