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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance | $ 1,025.7 | $ 845.2 | $ 674.2 | $ 617.8
Originations and purchases | 4,420.5 | 2,859.9 | 7,409.4 | 5,412.3
Proceeds from sales | (4,256.4) | (2,279.6) | (6,837.4) | (4,575.8)
Principal collections | (27.5) | (31.6) | (50.6) | (47.0)
Loans held for investment, at fair value | 0.8 | 1.5 | 1.9 | 3.1
Receivables, net | (7.6) | (15.6) | (18.2) | (14.5)
REO (Other assets) | (4.3) | (7.1) | (7.3) | (11.2)
Advances (capitalization upon Ginnie Mae modifications) | 2.8 | 1.7 | 4.9 | 3.7
Fair value gain (loss) on loans held for sale, at fair value (1) | (54.7) | (23.9) | (82.2) | (41.1)
Other | 4.5 | 2.3 | 9.2 | 5.5
Ending balance | 1,103.9 | 1,352.9 | 1,103.9 | 1,352.9
Principal amount outstanding on loans held for sale | 1,139.8 | 678.8 | 1,139.8 | 678.8
Premium (discount) balance on loans held for sale | (28.7) | (2.4) | (28.7) | (2.4)
Fair value adjustment to loans held for sale | (7.2) | (2.2) | (7.2) | (2.2)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 1,103.9 | $ 1,352.9 | 1,103.9 | $ 1,352.9
GSE loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 219.3 |
Ending balance | 558.0 |  | 558.0 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 558.0 |  | 558.0 |
Government- Forward loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 254.0 |
Ending balance | 263.0 |  | 263.0 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 263.0 |  | 263.0 |
Repurchased Ginnie Mae Loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 19.1 |
Ending balance | 23.9 |  | 23.9 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 23.9 |  | 23.9 |
Reverse Loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 166.6 |
Ending balance | 249.8 |  | 249.8 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | 249.8 |  | 249.8 |
Other residential mortgage loans |  |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |  |
Beginning balance |  |  | 15.2 |
Ending balance | 9.2 |  | 9.2 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans Held-for-sale, Fair Value Disclosure | $ 9.2 |  | $ 9.2 |

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