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Loans Held for Sale - Fair Value - Schedule of Loans Held for Sale Fair Value (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance | $ 2,048.3 | $ 1,103.9 | $ 1,290.2 | $ 674.2
Originations and purchases | 7,410.2 | 4,856.2 | 17,572.2 | 12,265.6
Proceeds from sales | (7,421.0) | (4,733.8) | (16,636.6) | (11,571.2)
Principal collections | (57.8) | (23.5) | (129.2) | (74.1)
Loans held for investment, at fair value | 6.1 | 1.0 | 11.8 | 2.9
Receivables | (15.8) | (9.2) | (36.5) | (27.4)
REO (Other assets) | (15.9) | (8.2) | (41.3) | (15.5)
Advances (incl. capitalization upon Ginnie Mae modifications) | 5.5 | 2.1 | 15.7 | 7.0
Fair value gain (loss) on loans held for sale, at fair value (1) | (48.6) | (0.1) | (157.5) | (82.3)
Other (2) | 4.6 | 7.2 | 26.8 | 16.4
Ending balance | 1,915.6 | 1,195.5 | 1,915.6 | 1,195.5
Principal amount outstanding on loans held for sale | 2,001.2 | 1,401.2 | 2,001.2 | 1,401.2
Premium (discount) balance on loans held for sale | (69.0) | (91.6) | (69.0) | (91.6)
Fair value adjustment to loans held for sale | (16.6) | (19.4) | (16.6) | (19.4)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 1,915.6 | $ 1,195.5 | 1,915.6 | $ 1,195.5
GSE loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 610.8 |
Ending balance | 605.4 |  | 605.4 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 605.4 |  | 605.4 |
Government- Forward loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 215.5 |
Ending balance | 638.1 |  | 638.1 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 638.1 |  | 638.1 |
Repurchased Ginnie Mae Loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 26.1 |
Ending balance | 43.6 |  | 43.6 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 43.6 |  | 43.6 |
Reverse Loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 432.4 |
Ending balance | 577.3 |  | 577.3 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 577.3 |  | 577.3 |
Other residential mortgage loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 5.3 |
Ending balance | 51.3 |  | 51.3 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | $ 51.3 |  | $ 51.3 |

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