Interest Expense - Schedule of Components of Interest Expense (Details) - USD ($) $ in Millions |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Debt securities: | ||||
| Interest expense | $ 103.1 | $ 75.6 | $ 185.7 | $ 142.7 |
| Mortgage warehouse facilities | ||||
| Debt securities: | ||||
| Interest expense | 27.3 | 21.7 | 48.2 | 37.7 |
| MSR financing facilities | ||||
| Debt securities: | ||||
| Interest expense | 25.4 | 21.6 | 46.2 | 40.2 |
| Advance match funded liabilities | ||||
| Debt securities: | ||||
| Interest expense | 5.9 | 7.8 | 12.1 | 15.7 |
| Escrow | ||||
| Debt securities: | ||||
| Interest expense | 2.0 | 1.6 | 3.7 | 3.3 |
| Senior Notes Due 2029 | ||||
| Debt securities: | ||||
| Interest expense | 17.7 | 12.9 | 33.8 | 25.7 |
| Secured Debt | Securitization Notes | ||||
| Debt securities: | ||||
| Interest expense | $ 24.8 | $ 10.1 | $ 41.7 | $ 20.2 |