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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
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Debt service accounts $ 71.2   $ 13.6
Debt Issuance Costs, Net 7.0 $ 7.7  
Advance match funded liabilities 430.4 513.7  
Variable Interest Entity, Primary Beneficiary      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Advance match funded liabilities 429.5 512.5  
Variable Interest Entity, Primary Beneficiary | Advance match funded liabilities      
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items]      
Match funded advances (Advances, net) 503.3 608.4  
Debt service accounts 14.6 15.8  
Debt Issuance Costs, Net 0.5 2.3  
Prepaid interest (Other assets) 0.7 0.9  
Advance match funded liabilities $ 429.5 $ 512.5