v3.26.1
Business Segment Reporting - Schedule of Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Results of Operations           
Servicing and subservicing fees $ 229.3 $ 211.3 $ 451.7 $ 414.6  
Gain on reverse loans and HMBS-related borrowings, net 3.8 11.9 22.5 35.7  
Gain on loans held for sale, net 29.4 10.4 63.5 22.2  
Other revenue, net 20.4 13.0 39.5 23.9  
Revenue 282.9 246.6 577.2 496.4  
MSR valuation adjustments, net (70.5) (27.3) (139.5) (66.2)  
Compensation and benefits 69.8 60.9 139.5 118.4  
Servicing and origination 23.1 13.0 41.6 26.0  
Technology and communications 17.9 15.5 35.4 30.5  
Professional services 16.7 8.4 31.4 31.0  
Occupancy, equipment and mailing 8.2 8.1 16.7 16.3  
Corporate Overhead Allocations 0.0 0.0 0.0 0.0  
Other expenses 3.3 3.7 6.6 7.2  
Total operating expenses 139.0 109.5 271.2 229.4  
Other income (expense):          
Interest income 55.5 32.1 96.5 58.3  
Interest expense (103.1) (75.6) (185.7) (142.7)  
Pledged MSR liability expense (38.2) (43.0) (80.8) (84.9)  
Other, net (2.7) (0.4) (3.6) 0.4  
Other income (expense), net (88.5) (87.0) (173.6) (168.8)  
Income (loss) before income taxes (15.1) 22.8 (7.1) 32.0  
Total Assets          
Total Assets 12,350.3   12,350.3   $ 16,170.6
Operating Segments | Servicing          
Results of Operations           
Servicing and subservicing fees 229.3 211.3 451.7 414.6  
Gain on reverse loans and HMBS-related borrowings, net 2.2 5.9 16.5 22.8  
Gain on loans held for sale, net (3.6) (5.0) (6.3) (8.8)  
Other revenue, net 5.7 5.0 12.2 9.7  
Revenue 233.6 217.1 474.1 438.3  
MSR valuation adjustments, net (83.1) (31.4) (163.6) (73.3)  
Compensation and benefits 21.8 22.9 45.0 46.0  
Servicing and origination 17.8 10.5 33.0 22.2  
Technology and communications 8.2 7.5 16.4 14.9  
Professional services 7.2 1.1 14.5 7.4  
Occupancy, equipment and mailing 6.4 6.9 13.7 14.1  
Corporate Overhead Allocations 14.6 13.1 29.3 25.5  
Other expenses 0.2 0.6 0.4 1.1  
Total operating expenses 76.2 62.6 152.3 131.2  
Other income (expense):          
Interest income 24.9 11.7 42.9 23.5  
Interest expense (71.6) (51.1) (130.1) (98.9)  
Pledged MSR liability expense (38.2) (43.0) (80.9) (85.0)  
Other, net (2.2) (0.2) (2.8) 0.3  
Other income (expense), net (87.1) (82.7) (170.9) (160.2)  
Income (loss) before income taxes (12.8) 40.4 (12.7) 73.5  
Total Assets          
Total Assets 9,880.3   9,880.3   14,683.5
Operating Segments | Originations          
Results of Operations           
Servicing and subservicing fees 0.0 0.0 0.0 0.0  
Gain on reverse loans and HMBS-related borrowings, net 1.6 6.1 6.0 12.9  
Gain on loans held for sale, net 33.0 15.4 69.8 31.0  
Other revenue, net 14.7 8.0 27.3 14.2  
Revenue 49.3 29.5 103.1 58.1  
MSR valuation adjustments, net 12.6 4.2 24.1 7.2  
Compensation and benefits 21.1 13.8 41.9 26.2  
Servicing and origination 5.3 2.6 8.6 3.7  
Technology and communications 3.1 2.3 5.9 4.3  
Professional services 0.6 0.5 1.1 1.0  
Occupancy, equipment and mailing 1.3 0.8 2.1 1.5  
Corporate Overhead Allocations 5.1 3.9 10.3 7.8  
Other expenses 1.2 1.7 2.8 3.2  
Total operating expenses 37.7 25.6 72.7 47.9  
Other income (expense):          
Interest income 29.6 19.4 51.4 32.7  
Interest expense (25.7) (18.3) (44.3) (31.0)  
Pledged MSR liability expense 0.0 0.0 0.0 0.0  
Other, net (0.7) (0.1) (1.1) (0.5)  
Other income (expense), net 3.2 1.0 6.0 1.2  
Income (loss) before income taxes 27.4 9.0 60.5 18.6  
Total Assets          
Total Assets 2,116.0   2,116.0   1,252.3
Operating Segments | Corporate          
Results of Operations           
Servicing and subservicing fees 0.0 0.0 0.0 0.0  
Gain on reverse loans and HMBS-related borrowings, net 0.0 0.0 0.0 0.0  
Gain on loans held for sale, net 0.0 0.0 0.0 0.0  
Other revenue, net 0.0 0.0 0.0 0.0  
Revenue 0.0 0.0 0.0 0.0  
MSR valuation adjustments, net 0.0 0.0 0.0 0.0  
Compensation and benefits 26.9 24.2 52.6 46.1  
Servicing and origination 0.0 (0.1) 0.0 0.1  
Technology and communications 6.6 5.7 13.1 11.2  
Professional services 8.9 6.8 15.8 22.7  
Occupancy, equipment and mailing 0.5 0.4 0.9 0.7  
Corporate Overhead Allocations (19.7) (17.0) (39.6) (33.4)  
Other expenses 1.9 1.3 3.4 2.9  
Total operating expenses 25.1 21.3 46.2 50.4  
Other income (expense):          
Interest income 1.0 1.1 2.2 2.1  
Interest expense (5.8) (6.3) (11.3) (12.7)  
Pledged MSR liability expense 0.0 0.0 0.1 0.1  
Other, net 0.2 (0.1) 0.3 0.7  
Other income (expense), net (4.6) (5.3) (8.7) (9.8)  
Income (loss) before income taxes (29.7) $ (26.6) (54.9) $ (60.2)  
Total Assets          
Total Assets $ 354.0   $ 354.0   $ 234.8