v3.26.3
Business Segment Reporting - Schedule of Segment Reporting Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Results of Operations           
Servicing and subservicing fees $ 224.7 $ 217.5 $ 676.4 $ 632.1  
Gain on reverse loans and HMBS-related borrowings, net 6.9 13.0 29.4 48.7  
Gain on loans held for sale, net 26.6 34.1 90.2 56.3  
Other revenue, net 19.9 15.7 59.4 39.6  
Revenue 278.1 280.3 855.4 776.7  
MSR valuation adjustments, net (67.3) (45.0) (206.8) (111.1)  
Compensation and benefits 55.5 63.3 194.9 181.7  
Servicing and origination 15.9 15.6 57.5 41.6  
Technology and communications 18.5 15.9 53.9 46.4  
Professional services 16.4 18.3 47.8 49.3  
Occupancy, equipment and mailing 8.2 9.1 24.9 25.4  
Corporate Overhead Allocations 0.0 0.0 0.0 0.0  
Other expenses 3.4 3.6 10.1 10.8  
Total operating expenses 117.9 125.8 389.1 355.2  
Other income (expense):          
Interest income 63.3 37.6 159.8 96.0  
Interest expense (115.5) (82.9) (301.2) (225.6)  
MSR Pledged liability expense 29.9 41.7 110.7 126.6  
Other, net (1.5) 0.5 (5.1) 0.9  
Other income (expense), net (83.6) (86.5) (257.2) (255.3)  
Income before income taxes 9.3 23.1 2.3 55.0  
Total Assets          
Total Assets 11,320.9   11,320.9   $ 16,170.6
Operating Segments | Servicing          
Results of Operations           
Servicing and subservicing fees 224.7 217.5 676.4 632.0  
Gain on reverse loans and HMBS-related borrowings, net 6.9 6.6 23.4 29.4  
Gain on loans held for sale, net 2.1 3.4 (4.2) (5.4)  
Other revenue, net 4.0 5.6 16.2 15.4  
Revenue 237.7 233.2 711.8 671.4  
MSR valuation adjustments, net (77.9) (48.6) (241.5) (121.9)  
Compensation and benefits 19.5 23.4 64.5 69.5  
Servicing and origination 10.9 12.1 43.9 34.3  
Technology and communications 8.7 7.5 25.2 22.4  
Professional services 7.5 9.2 21.9 16.5  
Occupancy, equipment and mailing 6.5 7.8 20.2 21.9  
Corporate Overhead Allocations 14.4 14.2 43.8 39.8  
Other expenses 0.6 0.5 1.0 1.6  
Total operating expenses 68.1 74.7 220.5 206.0  
Other income (expense):          
Interest income 28.3 13.3 71.2 36.8  
Interest expense (81.3) (56.8) (211.2) (155.7)  
MSR Pledged liability expense 29.9 41.7 110.8 126.7  
Other, net (1.6) 0.5 (4.4) 0.8  
Other income (expense), net (84.5) (84.6) (255.2) (244.8)  
Income before income taxes 7.2 25.2 (5.4) 98.7  
Total Assets          
Total Assets 9,578.0   9,578.0   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 0.0 6.4 6.0 19.3  
Gain on loans held for sale, net 24.5 30.7 94.4 61.7  
Other revenue, net 15.9 10.1 43.2 24.3  
Revenue 40.4 47.1 143.6 105.2  
MSR valuation adjustments, net 10.6 3.6 34.7 10.8  
Compensation and benefits 16.4 15.1 58.2 41.4  
Servicing and origination 5.0 3.6 13.6 7.3  
Technology and communications 3.3 2.5 9.2 6.8  
Professional services 0.6 0.4 1.7 1.4  
Occupancy, equipment and mailing 1.2 0.9 3.3 2.4  
Corporate Overhead Allocations 4.7 4.2 14.9 12.0  
Other expenses 1.2 1.5 4.0 4.7  
Total operating expenses 32.4 28.2 104.9 76.0  
Other income (expense):          
Interest income 34.1 23.3 85.5 56.1  
Interest expense (28.2) (20.8) (72.6) (51.8)  
MSR Pledged liability expense 0.0 0.0 0.0 0.0  
Other, net (0.5) (0.1) (1.6) (0.7)  
Other income (expense), net 5.4 2.4 11.3 3.6  
Income before income taxes 24.0 24.9 84.7 43.5  
Total Assets          
Total Assets 1,410.8   1,410.8   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 19.6 24.7 72.2 70.8  
Servicing and origination 0.0 (0.1) 0.0 0.0  
Technology and communications 6.5 5.9 19.5 17.1  
Professional services 8.3 8.7 24.2 31.4  
Occupancy, equipment and mailing 0.5 0.4 1.4 1.2  
Corporate Overhead Allocations (19.1) (18.4) (58.7) (51.8)  
Other expenses 1.6 1.6 5.1 4.5  
Total operating expenses 17.4 22.8 63.7 73.2  
Other income (expense):          
Interest income 0.9 1.0 3.1 3.1  
Interest expense (6.0) (5.4) (17.4) (18.1)  
MSR Pledged liability expense 0.0 0.0 (0.1) (0.1)  
Other, net 0.6 0.1 0.9 0.8  
Other income (expense), net (4.5) (4.3) (13.3) (14.1)  
Income before income taxes (21.9) $ (27.1) (77.0) $ (87.3)  
Total Assets          
Total Assets $ 332.1   $ 332.1   $ 234.8