Contingencies - Schedule of Indemnification Obligations (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Indemnification Obligations Liability [Roll Forward] | ||||
| Beginning balance | $ 23.0 | $ 27.4 | ||
| Provision for (reversal of) representation and warranty obligations | 2.5 | (1.5) | ||
| Provision for representation and warranty obligations - New production liability | 3.6 | 2.6 | ||
| Charge-offs and other | (6.7) | (5.2) | ||
| Ending balance | $ 22.4 | $ 23.3 | 22.4 | 23.3 |
| Servicing and subservicing fees | $ 224.7 | $ 217.5 | $ 676.4 | $ 632.1 |