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Borrowings - Schedule of Assets Held as Collateral Related to Secured Borrowings (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |  |
Cash (1) | $ 184.8 |  | $ 201.6 |
Restricted cash (2) | 80.8 |  | 53.5 |
MSRs | 2,466.3 |  | 2,272.2 |
Loans held for sale | 1,290.2 |  | 677.3 |
Loans held for investment - unsecuritized | 11,125.3 |  | 7,975.5 |
Advances, net | 577.2 |  | 678.8 |
Receivables, net ($31.9 and $19.9 related to VIEs) | 176.4 |  | 154.8 |
REO ($39.4 and $12.5 related to VIEs) | 43.9 |  | 18.3 |
Balance | 16,435.4 |  | 12,513.7 | $ 12,399.2
Senior Notes | 487.4 |  | 595.8 |
Secured Debt | Ginnie Mae Mortgage Servicing Rights Financing Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Uncommitted available borrowing capacity | 55.3 | $ 300.0 |  |
Pledged Assets | Secured Debt | Ginnie Mae Mortgage Servicing Rights Financing Facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Proceeds from mortgage loan warehouse facilities, net | 46.3 |  |  |
Senior Lien |  |  |  |
Debt Instrument [Line Items] |  |  |  |
MSRs | 1,530.8 |  |  |
Loans held for investment - securitized | 10,950.8 |  | 7,868.5 |
Loans held for investment - unsecuritized | 174.5 |  | $ 101.5 |
Advances, net | 577.2 |  |  |
Balance | 15,944.8 |  |  |
Senior Lien | Pledged Assets |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Cash (1) | 0.0 |  |  |
Restricted cash (2) | 40.4 |  |  |
MSRs | 1,537.4 |  |  |
Transferred MSRs, Including ESS | 935.4 |  |  |
Loans held for sale | 1,282.5 |  |  |
Loans held for investment - securitized | 10,950.8 |  |  |
Loans held for investment - unsecuritized | 98.5 |  |  |
Advances, net | 556.1 |  |  |
Receivables, net ($31.9 and $19.9 related to VIEs) | 106.9 |  |  |
REO ($39.4 and $12.5 related to VIEs) | 40.0 |  |  |
Balance | 15,548.0 |  |  |
Senior Lien | Collateralized Borrowings |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Cash (1) | 0.0 |  |  |
Restricted cash (2) | 0.0 |  |  |
MSRs | 911.7 |  |  |
Transferred MSRs, Including ESS | 846.9 |  |  |
Loans held for sale | 1,328.5 |  |  |
Loans held for investment - securitized | 10,872.1 |  |  |
Loans held for investment - unsecuritized | 89.2 |  |  |
Advances, net | 463.4 |  |  |
Receivables, net ($31.9 and $19.9 related to VIEs) | 98.9 |  |  |
REO ($39.4 and $12.5 related to VIEs) | 47.0 |  |  |
Balance | 14,657.7 |  |  |
Assets |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Cash (1) | 184.8 |  |  |
Restricted cash (2) | 80.8 |  |  |
Transferred MSRs, Including ESS | 935.4 |  |  |
Loans held for sale | 1,290.2 |  |  |
REO ($39.4 and $12.5 related to VIEs) | 43.9 |  |  |
Assets, Available Cash Held By Regulated Subsidiary Guarantors | $ 158.4 |  |  |

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- Definition Carrying amount as of the balance sheet date of non-interest-bearing advances made on loans serviced for others. Includes receivables for funds advanced by the servicer to meet contractual principal and interest remittance requirements for the investors, pay property taxes and insurance premiums and process foreclosures. Also includes receivables for funds advanced to maintain, repair and market foreclosed real estate properties on behalf of investors. + References No definition available. + Details
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