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Advances - Schedule of Advances Paid on Behalf of Borrowers or on Foreclosed Properties (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | $ 559.5 |  | $ 686.1 |  |  |
Allowance for losses | (8.9) | $ (7.7) | (7.3) | $ (7.4) | $ (6.2) | $ (6.2)
Advances, net | 550.6 |  | 678.8 |  |  |
Principal and interest |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | 180.0 |  | 212.5 |  |  |
Taxes and insurance |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | 253.6 |  | 343.3 |  |  |
Foreclosures, bankruptcy, REO and other (1) |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | 125.9 |  | $ 130.3 |  |  |
Foreclosures, bankruptcy, REO and other (1) | NEW YORK |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | 34.8 |  |  |  |  |
Foreclosures, bankruptcy, REO and other (1) | FLORIDA |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | 9.7 |  |  |  |  |
Foreclosures, bankruptcy, REO and other (1) | CALIFORNIA |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | 8.8 |  |  |  |  |
Foreclosures, bankruptcy, REO and other (1) | PENNSYLVANIA |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | 6.2 |  |  |  |  |
Foreclosures, bankruptcy, REO and other (1) | NEW JERSEY |  |  |  |  |  |
Advances On Behalf of Borrowers [Line Items] |  |  |  |  |  |
Advances, gross | $ 5.9 |  |  |  |  |

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