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Commitments - Schedule of Portfolio UPB (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Other Commitments [Line Items]  
Securitized Home Equity Conversion Mortgage-Backed Security $ 7,605.5
Maximum Claim Amount, Less Than 92%  
Other Commitments [Line Items]  
Securitized Home Equity Conversion Mortgage-Backed Security 7,106.1
Maximum Claim Amount, Greater than 92% and Less Than 95%  
Other Commitments [Line Items]  
Securitized Home Equity Conversion Mortgage-Backed Security 238.6
Maximum Claim Amount, Greater than 95% and less Than 98%  
Other Commitments [Line Items]  
Securitized Home Equity Conversion Mortgage-Backed Security $ 260.8