v3.26.3
Commitments - Schedule of Activity Related to HMBS Repurchases (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security $ 3,232.7  
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 334.3  
Additions, repurchase securities, amount 539.4 $ 394.4
Recoveries, net, repurchase securities, amount (522.8)  
Transfers, repurchase securities, amount 0.0  
Change in value, repurchase securities, amount (3.7)  
Ending balance, repurchase securities, amount 347.2  
Active HECM Loans, UPB Excluded, Directly Assigned 353.8 $ 1,100.0
Maximum Claim Amount, Less Than 92%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 2,783.4  
Maximum Claim Amount, Greater than 92% and Less Than 95%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 214.8  
Maximum Claim Amount, Greater than 95% and less Than 98%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 234.5  
Active (1)    
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 77.1  
Additions, repurchase securities, amount 457.6  
Recoveries, net, repurchase securities, amount (435.5)  
Transfers, repurchase securities, amount 4.4  
Change in value, repurchase securities, amount (0.3)  
Ending balance, repurchase securities, amount 103.3  
Inactive    
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 257.2  
Additions, repurchase securities, amount 81.8  
Recoveries, net, repurchase securities, amount (87.3)  
Transfers, repurchase securities, amount (4.4)  
Change in value, repurchase securities, amount (3.4)  
Ending balance, repurchase securities, amount $ 243.9