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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Mortgage securitizations - U.S. agency sponsored      
Cash Flows Between Transferor and Transferee      
Principal securitized $ 1,600.0 $ 1,400.0  
Proceeds from new securitizations 1,700.0 1,500.0  
Contractual servicing fees received 0.0 0.0  
Cash flows received on retained interests and other net cash flows 0.0 0.0  
Purchases of previously transferred financial assets 0.0 0.0  
Gains recognized on the securitization 1.0 1.0  
Carrying value of retained interests 776.0   $ 783.0
Mortgage securitizations - Non-agency-sponsored      
Cash Flows Between Transferor and Transferee      
Principal securitized 1,300.0 1,000.0  
Proceeds from new securitizations 1,300.0 1,000.0  
Contractual servicing fees received 0.0 0.0  
Cash flows received on retained interests and other net cash flows 0.0 0.0  
Purchases of previously transferred financial assets 0.0 0.0  
Gains recognized on the securitization 60.8 $ 36.5  
Senior interests      
Cash Flows Between Transferor and Transferee      
Carrying value of retained interests 918.0   902.0
Subordinated interests      
Cash Flows Between Transferor and Transferee      
Carrying value of retained interests 1,040.0   $ 1,058.0
Personal installment loan      
Cash Flows Between Transferor and Transferee      
Principal securitized 300.0    
Proceeds from new securitizations 200.0    
Gains recognized on the securitization $ 0.2