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Fair Value - Schedule of Fair Value Assets and Liabilities (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Loans held for sale |  |  |  |  |  |
Loans held for sale, at fair value | $ 1,103.9 | $ 1,025.7 | $ 674.2 | $ 1,352.9 | $ 845.2 | $ 617.8
Financial liabilities |  |  |  |  |  |
Advance match funded liabilities | 405.0 |  | 499.7 |  |  |
Financing liabilities, at fair value: |  |  |  |  |  |
HMBS-related borrowings | 8,035.4 | 7,945.0 | 7,797.3 | 7,486.4 | 7,470.6 | 7,326.8
Other financing liabilities, at fair value | 845.9 |  | 900.0 |  |  |
Other secured borrowings: |  |  |  |  |  |
Mortgage loan financing facilities, net ($280.1 and $143.4 related to VIEs) | 1,190.5 |  | 710.6 |  |  |
MSR financing facilities | 927.7 |  | 916.2 |  |  |
Senior notes |  |  |  |  |  |
Total Senior notes | 555.2 |  | 595.8 |  |  |
Mortgage servicing rights |  |  |  |  |  |
MSRs | 2,327.7 | 2,374.7 | 2,272.2 |  | 2,580.6 | 2,665.2
Carrying Value |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |
Total Loans held for sale | 1,107.0 |  | 677.3 |  |  |
Loans held for investment, at fair value | 8,227.8 |  | 7,975.5 |  |  |
Financing liabilities, at fair value: |  |  |  |  |  |
Other financing liabilities, at fair value | 845.9 |  | 900.0 |  |  |
Senior notes |  |  |  |  |  |
Total Senior notes | 555.2 |  | 595.8 |  |  |
Fair Value |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |
Total Loans held for sale | 1,107.0 |  | 677.3 |  |  |
Loans held for investment, at fair value | 8,227.8 |  | 7,975.5 |  |  |
Financing liabilities, at fair value: |  |  |  |  |  |
Other financing liabilities, at fair value | 845.9 |  | 900.0 |  |  |
Senior notes |  |  |  |  |  |
Total Senior notes | 561.6 |  | 556.5 |  |  |
ESS Financing Liability |  |  |  |  |  |
Financing liabilities, at fair value: |  |  |  |  |  |
Other financing liabilities, at fair value | 250.5 |  | 248.9 |  |  |
Level 3 | Carrying Value |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |
Loans held for sale, at fair value | 1,103.9 |  | 674.2 |  |  |
Loans held for sale, at lower of cost or fair value | 3.1 |  | 3.1 |  |  |
Loans held for investment, at fair value | 8,222.4 |  | 7,970.0 |  |  |
Advances, net | 550.6 |  | 678.8 |  |  |
Receivables, net | 153.4 |  | 154.8 |  |  |
Financial liabilities |  |  |  |  |  |
Advance match funded liabilities | 405.0 |  | 499.7 |  |  |
Financing liabilities, at fair value: |  |  |  |  |  |
HMBS-related borrowings | 8,035.4 |  | 7,797.3 |  |  |
Other secured borrowings: |  |  |  |  |  |
Mortgage loan financing facilities, net ($280.1 and $143.4 related to VIEs) | 1,190.5 |  | 710.6 |  |  |
MSR financing facilities | 927.7 |  | 916.2 |  |  |
Mortgage servicing rights |  |  |  |  |  |
MSRs | 2,327.7 |  | 2,272.2 |  |  |
Level 3 | Carrying Value | Second Lien |  |  |  |  |  |
Senior notes |  |  |  |  |  |
Senior secured notes | 245.3 |  | 239.7 |  |  |
Level 3 | Fair Value |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |
Loans held for sale, at fair value | 1,103.9 |  | 674.2 |  |  |
Loans held for sale, at lower of cost or fair value | 3.1 |  | 3.1 |  |  |
Loans held for investment, at fair value | 8,222.4 |  | 7,970.0 |  |  |
Advances, net | 550.6 |  | 678.8 |  |  |
Receivables, net | 153.4 |  | 154.8 |  |  |
Financial liabilities |  |  |  |  |  |
Advance match funded liabilities | 405.0 |  | 499.7 |  |  |
Financing liabilities, at fair value: |  |  |  |  |  |
HMBS-related borrowings | 8,035.4 |  | 7,797.3 |  |  |
Other secured borrowings: |  |  |  |  |  |
Mortgage loan financing facilities, net ($280.1 and $143.4 related to VIEs) | 1,196.5 |  | 717.6 |  |  |
MSR financing facilities | 914.0 |  | 900.3 |  |  |
Mortgage servicing rights |  |  |  |  |  |
MSRs | 2,327.7 |  | 2,272.2 |  |  |
Level 3 | Fair Value | Second Lien |  |  |  |  |  |
Senior notes |  |  |  |  |  |
Senior secured notes | 256.3 |  | 230.5 |  |  |
Level 3 | Interest Rate Contract | Carrying Value |  |  |  |  |  |
Derivative financial instrument assets (liabilities), net |  |  |  |  |  |
Interest rate lock commitments | 4.1 |  | 5.6 |  |  |
Level 3 | Interest Rate Contract | Fair Value |  |  |  |  |  |
Derivative financial instrument assets (liabilities), net |  |  |  |  |  |
Interest rate lock commitments | 4.1 |  | 5.6 |  |  |
Level 3 | Other | Carrying Value |  |  |  |  |  |
Derivative financial instrument assets (liabilities), net |  |  |  |  |  |
Other commitments (a) | 0.0 |  | (0.1) |  |  |
Level 3 | Other | Fair Value |  |  |  |  |  |
Derivative financial instrument assets (liabilities), net |  |  |  |  |  |
Other commitments (a) | 0.0 |  | (0.1) |  |  |
Level 3 | ESS Financing Liability |  |  |  |  |  |
Mortgage servicing rights |  |  |  |  |  |
Loans related to Ginnie Mae guaranteed securitizations | (250.5) | (253.4) | (248.9) | (258.5) | (263.1) | (199.0)
Level 3 | Loans Held for Sale - Fair Value |  |  |  |  |  |
Mortgage servicing rights |  |  |  |  |  |
Loans related to Ginnie Mae guaranteed securitizations | 296.7 | $ 284.0 | 203.1 | $ 197.4 | $ 23.3 | $ 32.1
Level 3 | Loans Held for Investment Securitization Trusts | Carrying Value |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |
Loans held for investment, at fair value | 5.4 |  | 5.6 |  |  |
Level 3 | Loans Held for Investment Securitization Trusts | Fair Value |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |
Loans held for investment, at fair value | 5.4 |  | 5.6 |  |  |
Level 2 | Carrying Value |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |
Loans held for sale, at fair value | 1,103.9 |  | 674.2 |  |  |
Senior notes |  |  |  |  |  |
Senior secured notes | 309.9 |  | 356.1 |  |  |
Level 2 | Fair Value |  |  |  |  |  |
Loans held for sale |  |  |  |  |  |
Loans held for sale, at fair value | 1,103.9 |  | 674.2 |  |  |
Senior notes |  |  |  |  |  |
Senior secured notes | 305.3 |  | 326.0 |  |  |
Level 1 | Other | Carrying Value |  |  |  |  |  |
Derivative financial instrument assets (liabilities), net |  |  |  |  |  |
Interest rate lock commitments | (1.4) |  | 9.1 |  |  |
Level 1 | Other | Fair Value |  |  |  |  |  |
Derivative financial instrument assets (liabilities), net |  |  |  |  |  |
Interest rate lock commitments | $ (1.4) |  | $ 9.1 |  |  |

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- Definition This represents the amount of liability which is a resultant of reverse mortgage loans sold into the secondary with servicing rights retained. As the transfer of these loans do not meet the definition of participating interest because of the servicing requirement that requires the issuer to absorb some level of risk, these transfers are accounted for as financing. + References No definition available. + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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