v3.26.1
Commitments - Schedule of Activity Related to HMBS Repurchases (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security $ 8,937.0  
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 334.3  
Additions, repurchase securities, amount 233.8 $ 156.9
Recoveries, net, repurchase securities, amount (59.0)  
Transfers, repurchase securities, amount 0.0  
Change in value, repurchase securities, amount (1.6)  
Ending balance, repurchase securities, amount 507.6  
Active HECM Loans, UPB Excluded, Directly Assigned 120.2 $ 381.6
Maximum Claim Amount, Less Than 92%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 8,235.7  
Maximum Claim Amount, Greater than 92% and Less Than 95%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 318.7  
Maximum Claim Amount, Greater than 95% and less Than 98%    
Long-term Purchase Commitment [Line Items]    
Securitized Home Equity Conversion Mortgage-Backed Security 382.6  
Active (2)    
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 77.1  
Additions, repurchase securities, amount 200.3  
Recoveries, net, repurchase securities, amount (31.5)  
Transfers, repurchase securities, amount 4.6  
Change in value, repurchase securities, amount 0.0  
Ending balance, repurchase securities, amount 250.6  
Inactive    
Long-term Purchase Commitment [Roll Forward]    
Beginning balance, repurchase securities, amount 257.2  
Additions, repurchase securities, amount 33.5  
Recoveries, net, repurchase securities, amount (27.5)  
Transfers, repurchase securities, amount (4.6)  
Change in value, repurchase securities, amount (1.6)  
Ending balance, repurchase securities, amount $ 257.0