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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, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance | $ 1,103.9 | $ 1,352.9 | $ 674.2 | $ 617.8
Originations and purchases | 4,856.2 | 4,418.0 | 12,265.6 | 9,830.3
Proceeds from sales | (4,733.8) | (4,697.9) | (11,571.2) | (9,273.6)
Principal collections | (23.5) | (19.6) | (74.1) | (66.6)
Loans held for investment, at fair value | 1.0 | 1.5 | 2.9 | 4.6
Receivables, net | (9.2) | (11.5) | (27.4) | (26.0)
REO (Other assets) | (8.2) | (3.6) | (15.5) | (14.8)
Advances (capitalization upon Ginnie Mae modifications) | 2.1 | 1.3 | 7.0 | 5.0
Fair value gain (loss) on loans held for sale, at fair value (1) | (0.1) | (93.9) | (82.3) | (135.0)
Other | 7.2 | (2.5) | 16.4 | 3.0
Ending balance | 1,195.5 | 944.7 | 1,195.5 | 944.7
Principal amount outstanding on loans held for sale | 1,283.6 | 678.8 | 1,283.6 | 678.8
Premium (discount) balance on loans held for sale | (89.5) | (2.4) | (89.5) | (2.4)
Fair value adjustment to loans held for sale | 1.4 | (2.2) | 1.4 | (2.2)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 1,195.5 | $ 944.7 | 1,195.5 | $ 944.7
GSE loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 219.3 |
Ending balance | 630.7 |  | 630.7 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 630.7 |  | 630.7 |
Government- Forward loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 254.0 |
Ending balance | 130.9 |  | 130.9 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 130.9 |  | 130.9 |
Repurchased Ginnie Mae Loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 19.1 |
Ending balance | 19.9 |  | 19.9 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 19.9 |  | 19.9 |
Reverse Loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 166.6 |
Ending balance | 407.5 |  | 407.5 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 407.5 |  | 407.5 |
Other residential mortgage loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 15.2 |
Ending balance | 6.6 |  | 6.6 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | $ 6.6 |  | $ 6.6 |

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