v3.26.3
Reverse Mortgages - Schedule of Loans Held For Sale and Investment and HMBS Related Borrowings (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Dec. 31, 2024
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance, Reconciliation to Cash Flow [Roll Forward]                
Loans Held For Sale, Reverse Mortgages, Unpaid Principal           $ 9,333.0    
Loans Held For Sale, Reverse Mortgages, Fair Value Adjustment           474.5    
Beginning balance $ 3,640.6 $ 10,470.8 $ 0.0 $ 11,125.3        
Originations (1) 26.6 249.3 45.3 794.8        
Repayments (principal payments received) (2) (320.8) (778.3) (565.4) (2,341.6)        
Reclassifications     3,837.3          
Loans held for sale, at fair value (0.5) (6.1) (1.2) (11.8)        
Receivables, net (1.2) (1.4) (1.5) (6.3)        
REO (Other assets) 0.0 (0.5) (0.1) (0.8)        
Other 1.0 4.9 1.7 4.8        
Change in fair value 16.9 178.6 46.4          
Ending balance 3,362.6 10,117.4 3,362.6 10,117.4        
Beginning balance 0.0   9,807.5          
Loans Held For Sale, Reverse Mortgages, Originations 0.3   279.6          
HMBS Related Borrowings, Sales 0.0   5,503.1 0.0        
Sale (0.2)   (5,629.8) 0.0        
Repayments (principal payments received) (2) 0.0   (870.9)          
Reclassifications     (3,837.3)          
Loans held for sale, at fair value 0.1   2.3          
Receivables, net 0.0   2.1          
REO (Other assets) 0.0   0.2          
Other 0.0   (1.9)          
Fair value gains (losses) included in earnings (3) 0.0   253.5          
Ending balance 0.0   0.0          
HMBS Related Borrowings                
HMBS-related borrowings, at fair value 3,335.1 9,924.6 3,335.1 9,924.6 $ 3,610.9 9,611.7 $ 10,253.1 $ 10,872.1
Securitization of HECM loans accounted for as a financing (25.5) (269.3) (357.1) (847.0)        
Additional proceeds from securitization of HECM loans and tails (0.4) (5.9) (11.8) (13.0)        
Repayments (principal payments received) (2) 318.4 770.2 1,424.2 2,314.8        
Change in fair value (16.7) (166.5) (281.8) (507.2)        
Ending balance (3,335.1) $ (9,924.6) (3,335.1) $ (9,924.6)        
Loans Held For Sale, Reverse Mortgages, Repayments Of Loans Previously Held For Investment     1,434.1          
Repayment Of Reverse Mortgages (320.8)   (1,436.3)          
Loans Held For Investment, Reverse Mortgages, Unpaid Principal 3,310.0   3,310.0          
Loans Held For Investment, Reverse Mortgages, Fair Value Adjustment 52.6   52.6          
New HECM Loan Originations And HECM Loan Tails - Unsecuritized                
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance, Reconciliation to Cash Flow [Roll Forward]                
Ending balance 12.6   12.6          
Beginning balance     104.4          
Loans Receivable, Fair Value Disclosure, Pending Pooling 0.0   0.0     $ 58.4    
HECM Loans - Securitized, Pledged To HMBS-Related Borrowings                
Financing Receivable, Held-for-Sale, Not Part of Disposal Group, after Valuation Allowance, Reconciliation to Cash Flow [Roll Forward]                
Ending balance $ 3,350.0   3,350.0          
Beginning balance     $ 9,703.1