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Borrowings - Schedule of Mortgage Loan Warehouse Facilities (Details) - USD ($) $ in Millions | 1 Months Ended |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2024 | Apr. 30, 2024 | Dec. 31, 2024 | Oct. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 04, 2024 | Feb. 29, 2024 | Dec. 31, 2023 | Jun. 15, 2023
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Debt Instrument, Repurchase Agreement, Membership Interest |  |  |  |  |  |  | 100.00% |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  | $ (35.4) |  |  |  |  |  | $ (21.0) |
Mortgage Loan Warehouse Facilities |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Secured Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Senior notes |  |  | 957.9 |  |  |  |  |  | 916.2 |
Unamortized debt issuance costs |  |  | (0.1) |  |  |  |  |  | (0.4) |
Secured Debt | Securitization Notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Long-term debt, gross |  |  | 517.3 |  |  |  |  |  | 164.4 |
Secured Debt | Master Repurchase Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 125.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 2.7 |  |  |  |  |  |  |
Short-term debt |  |  | 47.3 |  |  |  |  |  | 15.7 |
Secured Debt | Master Repurchase Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 350.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Short-term debt |  |  | 0.0 |  |  |  |  |  | 0.0 |
Secured Debt | Participation Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 278.2 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Short-term debt |  |  | 221.8 |  |  |  |  |  | 83.9 |
Maximum borrowing capacity |  |  |  |  | $ 500.0 |  |  |  |  |
Secured Debt | Master Repurchase Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 119.3 |  |  |  |  |  |  |
Short-term debt |  |  | 130.7 |  |  |  |  |  | 64.2 |
Maximum borrowing capacity |  |  |  |  | 250.0 |  |  |  |  |
Secured Debt | Master Repurchase Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 1.0 |  |  |  |  |  |  |
Short-term debt |  |  | 0.0 |  |  |  |  |  | 0.0 |
Secured Debt | Mortgage Warehouse Agreement Two |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 40.0 |  |  |  |  |  |  |
Short-term debt |  |  | 0.0 |  |  |  |  |  | 0.0 |
Secured Debt | Mortgage Warehouse Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 63.8 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Short-term debt |  |  | 141.2 |  |  |  |  |  | 71.1 |
Secured Debt | Mortgage Warehouse Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 220.7 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Short-term debt |  |  | 9.3 |  |  |  |  |  | 12.2 |
Secured Debt | Master Repurchase Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Short-term debt |  |  | 200.5 |  |  |  |  |  | 151.7 |
Line Of Credit Facility, Capacity Available For Specific Purpose Other Than For Trade Purchases, Increased (Decreased) Balance |  | $ (50.0) |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 200.0 |  |  |  |  |  |  |  |
Secured Debt | Loan and Security Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Short-term debt |  |  | 0.0 |  |  |  |  |  | 0.0 |
Secured Debt | Master Repurchase Agreement- Flagstar |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 250.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 11.5 |  |  |  |  |  |  |
Short-term debt |  |  | 238.5 |  |  |  |  |  | 168.4 |
Secured Debt | $200 million April 2024 Master Repurchase Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Short-term debt |  |  | 0.0 |  |  |  |  |  | 0.0 |
Secured Debt | OLIT 2023 Notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  |  |  |  |  | $ 264.9
Debt instrument stated percentage of interest (percentage) |  |  |  |  |  | 3.00% |  |  |  |
Secured Debt | OLIT 2023 Notes | Securitization Notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Long-term debt, gross |  |  | 107.3 |  |  |  |  |  | 164.4 |
Secured Debt | September 2024 Loan and Security Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 29.2 |  |  |  |  |  |  |
Short-term debt |  |  | 10.8 |  |  |  |  |  | 0.0 |
Maximum borrowing capacity |  |  |  |  | 40.0 |  |  |  |  |
Secured Debt | Loan And Security Agreement - LHFI and Servicing Advances |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 8.8 |  |  |  |  |  |  |
Long-term debt, gross |  |  | 36.2 |  |  |  |  |  | 0.0 |
Maximum borrowing capacity |  |  |  | $ 15.0 | 45.0 |  |  |  |  |
Secured Debt | Securities Master Repurchase Agreement - Receivables and REO |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 6.6 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Short-term debt |  |  | 10.0 |  |  |  |  |  | 0.0 |
Secured Debt | OLIT Asset-Backed Notes, Series 2024-HB1 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  |  |  |  | $ 268.6 |  |
Debt instrument stated percentage of interest (percentage) |  |  |  |  |  | 3.00% |  |  |  |
Secured Debt | OLIT Asset-Backed Notes, Series 2024-HB1 | Securitization Notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Long-term debt, gross |  |  | 160.9 |  |  |  |  |  | 0.0 |
Secured Debt | OLIT Asset-Backed Notes, Series 2024 HB2 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Long-term debt, gross |  |  |  |  | $ 330.6 |  |  |  |  |
Debt instrument stated percentage of interest (percentage) |  |  |  |  |  | 5.00% |  |  |  |
Secured Debt | OLIT Asset-Backed Notes, Series 2024 HB2 | Securitization Notes |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 0.0 |  |  |  |  |  |  |
Long-term debt, gross |  |  | 249.1 |  |  |  |  |  | 0.0 |
Secured Debt | January 2024 Mortgage Warehouse Agreement |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Line Of Credit Facility, Capacity Available For Specific Purpose Other Than For Trade Purchases, Increased (Decreased) Balance | $ (205.0) |  |  |  |  |  |  |  |  |
Secured Debt | Total Financing Agreements |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 1,294.3 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 212.5 |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  | $ 1,046.3 |  |  |  |  |  | $ 567.2 |
Mortgage Loan Warehouse Facilities |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (percentage) |  |  | 5.46% |  |  |  |  |  | 6.15% |
Unamortized debt issuance costs |  |  | $ (1.0) |  |  |  |  |  | $ (1.0) |
Mortgage Loan Warehouse Facilities | Secured Debt |  |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |  |
Uncommitted available borrowing capacity |  |  | 1,294.3 |  |  |  |  |  |  |
Available borrowing capacity |  |  | 212.5 |  |  |  |  |  |  |
Debt, Long-Term and Short-Term, Combined Amount |  |  | 1,563.6 |  |  |  |  |  | 731.6 |
Senior notes |  |  | $ 1,528.2 |  |  |  |  |  | $ 710.6 |

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