Commitments and Contingencies (Details) - USD ($) $ in Millions |
6 Months Ended | ||
|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Commitments and Contingencies Disclosure [Abstract] | |||
| Loan subject to loss-sharing arrangements, aggregate unpaid principal amount | $ 26,800.0 | $ 25,800.0 | |
| Loan loss accrual | 29.7 | 30.4 | |
| Loan loss guarantee reserve | 24.0 | $ 29.9 | |
| Level of risk retained (per claim) | 10.0 | ||
| Loss Contingency Accrual [Roll Forward] | |||
| Loan loss incurred [Abstract] | 20.6 | ||
| Insurance Claims [Member] | |||
| Loss Contingency Accrual [Roll Forward] | |||
| Loss Contingency Accrual | 1.4 | $ 4.2 | |
| Loss Contingency Accrual, Loss (Reversal of Loss) | 3.3 | 3.0 | |
| Loss Contingency Accrual, Provision Adjustment | 0.9 | 0.3 | |
| Loss Contingency Accrual, Payments | (2.5) | ||
| Loss Contingency Accrual | $ 5.6 | $ 5.0 | |