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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
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Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | $ 531.1 |  | $ 686.1 |  |  |
Allowance for losses | (8.4) | $ (8.9) | (7.3) | $ (7.2) | $ (7.4) | $ (6.2)
Advances, net | 522.7 |  | 678.8 |  |  |
GSE |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, net | 49.8 |  | 100.8 |  |  |
GinnieMae |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, net | 54.3 |  | 60.2 |  |  |
Non-Agency |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, net | 418.6 |  | 517.7 |  |  |
Principal and interest |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | 166.1 |  | 212.5 |  |  |
Taxes and insurance |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | 240.3 |  | 343.3 |  |  |
Foreclosures, bankruptcy, REO and other (1) |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | 124.7 |  | $ 130.3 |  |  |
Foreclosures, bankruptcy, REO and other (1) | NEW YORK |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | 33.5 |  |  |  |  |
Foreclosures, bankruptcy, REO and other (1) | FLORIDA |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | 9.1 |  |  |  |  |
Foreclosures, bankruptcy, REO and other (1) | CALIFORNIA |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | 8.9 |  |  |  |  |
Foreclosures, bankruptcy, REO and other (1) | PENNSYLVANIA |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | 5.7 |  |  |  |  |
Foreclosures, bankruptcy, REO and other (1) | NEW JERSEY |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | $ 5.3 |  |  |  |  |

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