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Fair Value - Schedule of Carrying Amounts and Estimated Fair Values of Financial Instruments and Nonfinancial Assets Measured at Fair Value on a Recurring or Non-recurring basis or Disclosed, but not Carried, at Fair Value (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Financial assets: |  |  |  |
Loans held for sale, at fair value | $ 674.2 | $ 617.8 | $ 917.5 | $ 366.4
Total Loans held for sale | 674.2 | 617.8 |  |
Investment in equity method investee | 37.8 | 42.2 |  |
Financial liabilities: |  |  |  |
Advance match funded liabilities ($498.9 and $512.5 related to VIEs) | 499.7 | 513.7 |  |
Financing liabilities, at fair value: |  |  |  |
HMBS-related borrowings | 7,797.3 | 7,326.8 | 6,885.0 | $ 6,772.7
Other financing liabilities | 900.0 | 1,137.4 |  |
Secured Debt [Abstract] |  |  |  |
Long-term Line of Credit | 916.2 | 953.8 |  |
Senior notes: |  |  |  |
Senior Notes | 595.8 | 599.6 |  |
Mortgage Service Rights |  |  |  |
MSRs | 2,272.2 | 2,665.2 | $ 2,250.1 |
Financing Liability Excess Servicing Spread |  |  |  |
Financing liabilities, at fair value: |  |  |  |
Other financing liabilities | 248.9 | 199.0 |  |
Carrying Value |  |  |  |
Financial assets: |  |  |  |
Total Loans held for sale | 677.3 | 622.7 |  |
Loans held for investment | 7,975.5 | 7,510.8 |  |
Financing liabilities, at fair value: |  |  |  |
Total Other financing liabilities | 900.0 | 1,137.4 |  |
Senior notes: |  |  |  |
Senior Notes | 595.8 | 599.6 |  |
Fair Value |  |  |  |
Financial assets: |  |  |  |
Total Loans held for sale | 677.3 | 622.7 |  |
Loans held for investment | 7,975.5 | 7,510.8 |  |
Financing liabilities, at fair value: |  |  |  |
Total Other financing liabilities | 900.0 | 1,137.4 |  |
Senior notes: |  |  |  |
Senior Notes | 556.5 | 555.2 |  |
Level 2 | Carrying Value |  |  |  |
Financial assets: |  |  |  |
Loans held for sale, at fair value | 674.2 | 617.8 |  |
Senior notes: |  |  |  |
Senior unsecured notes | 356.1 | 369.4 |  |
Level 2 | Carrying Value | Option Contracts |  |  |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Derivative liabilities | 1.9 | 0.0 |  |
Level 2 | Fair Value |  |  |  |
Financial assets: |  |  |  |
Loans held for sale, at fair value | 674.2 | 617.8 |  |
Senior notes: |  |  |  |
Senior unsecured notes | 326.0 | 331.4 |  |
Level 2 | Fair Value | Option Contracts |  |  |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Derivative liabilities | 1.9 | 0.0 |  |
Level 3 | Carrying Value |  |  |  |
Financial assets: |  |  |  |
Loans held for sale, at lower of cost or fair value | 3.1 | 4.9 |  |
Loans held for investment | 7,970.0 | 7,504.1 |  |
Advances (including match funded) | 678.8 | 718.9 |  |
Receivables, net | 154.8 | 180.8 |  |
Financial liabilities: |  |  |  |
Advance match funded liabilities ($498.9 and $512.5 related to VIEs) | 499.7 | 513.7 |  |
Financing liabilities, at fair value: |  |  |  |
HMBS-related borrowings | 7,797.3 | 7,326.8 |  |
Secured Debt [Abstract] |  |  |  |
Long-term Line of Credit | 916.2 | 953.8 |  |
Other | 710.6 | 702.7 |  |
Senior notes: |  |  |  |
Senior secured notes | 239.7 | 230.2 |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Interest rate lock commitments | 5.6 | 0.7 |  |
Mortgage Service Rights |  |  |  |
MSRs | 2,272.2 | 2,665.2 |  |
Level 3 | Carrying Value | Derivative [Member] |  |  |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Derivative liabilities | (0.1) | (0.1) |  |
Level 3 | Carrying Value | Loans Held for Investments - Restricted for Securitization Investors |  |  |  |
Financial assets: |  |  |  |
Loans held for investment | 5.6 | 6.7 |  |
Level 3 | Carrying Value | Financing Liability - MSRs Pledged |  |  |  |
Financing liabilities, at fair value: |  |  |  |
Other financing liabilities | 645.5 | 931.7 |  |
Level 3 | Carrying Value | Financing Liability Owed to Securitization Investors |  |  |  |
Financing liabilities, at fair value: |  |  |  |
Other financing liabilities | 5.6 | 6.7 |  |
Level 3 | Carrying Value | Financing Liability Excess Servicing Spread |  |  |  |
Financing liabilities, at fair value: |  |  |  |
Other financing liabilities | 248.9 | 199.0 |  |
Level 3 | Fair Value |  |  |  |
Financial assets: |  |  |  |
Loans held for sale, at lower of cost or fair value | 3.1 | 4.9 |  |
Loans held for investment | 7,970.0 | 7,504.1 |  |
Advances (including match funded) | 678.8 | 718.9 |  |
Receivables, net | 154.8 | 180.8 |  |
Financial liabilities: |  |  |  |
Advance match funded liabilities ($498.9 and $512.5 related to VIEs) | 499.7 | 513.7 |  |
Financing liabilities, at fair value: |  |  |  |
HMBS-related borrowings | 7,797.3 | 7,326.8 |  |
Secured Debt [Abstract] |  |  |  |
Long-term Line of Credit | 900.3 | 932.1 |  |
Other | 717.6 | 702.7 |  |
Senior notes: |  |  |  |
Senior secured notes | 230.5 | 223.9 |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Interest rate lock commitments | 5.6 | 0.7 |  |
Mortgage Service Rights |  |  |  |
MSRs | 2,272.2 | 2,665.2 |  |
Level 3 | Fair Value | Derivative [Member] |  |  |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Derivative liabilities | (0.1) | (0.1) |  |
Level 3 | Fair Value | Loans Held for Investments - Restricted for Securitization Investors |  |  |  |
Financial assets: |  |  |  |
Loans held for investment | 5.6 | 6.7 |  |
Level 3 | Fair Value | Financing Liability - MSRs Pledged |  |  |  |
Financing liabilities, at fair value: |  |  |  |
Other financing liabilities | 645.5 | 931.7 |  |
Level 3 | Fair Value | Financing Liability Owed to Securitization Investors |  |  |  |
Financing liabilities, at fair value: |  |  |  |
Other financing liabilities | 5.6 | 6.7 |  |
Level 3 | Fair Value | Financing Liability Excess Servicing Spread |  |  |  |
Financing liabilities, at fair value: |  |  |  |
Other financing liabilities | 248.9 | 199.0 |  |
Level 1 | Carrying Value | Forward LHFS Trades |  |  |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Derivative Asset | (0.1) |  |  |
Derivative liabilities |  | 0.5 |  |
Level 1 | Carrying Value | TBA/Forward Mortgage Backed Securities Trades |  |  |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Derivative liabilities | 9.6 | (0.7) |  |
Level 1 | Carrying Value | Interest Rate Swap |  |  |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Derivative Asset | 3.9 | (13.6) |  |
Level 1 | Carrying Value | TBA Forward Pipelines Trades |  |  |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Derivative Asset | (6.3) | 6.6 |  |
Level 1 | Fair Value | Forward LHFS Trades |  |  |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Derivative Asset | (0.1) |  |  |
Derivative liabilities |  | 0.5 |  |
Level 1 | Fair Value | TBA/Forward Mortgage Backed Securities Trades |  |  |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Derivative liabilities | 9.6 | (0.7) |  |
Level 1 | Fair Value | Interest Rate Swap |  |  |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Derivative Asset | 3.9 | (13.6) |  |
Level 1 | Fair Value | TBA Forward Pipelines Trades |  |  |  |
Derivative financial instrument assets (liabilities), at fair value |  |  |  |
Derivative Asset | $ (6.3) | $ 6.6 |  |

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents advances and match funded advances. + References No definition available. + Details
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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 This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents loans held-for-sale at lower cost of fair value as presented on the statement of financial position which may include mortgage loans held-for-sale, finance receivables held-for-sale, or any other loans classified as held-for-sale which are due the Company as of the balance sheet date. + References No definition available. + Details
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- Definition This element represents the home equity conversion mortgages insured by FHA. + References No definition available. + Details
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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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://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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 470 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481139/470-20-50-4 + Details
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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. 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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 210 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483466/210-20-50-3 + Details
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- Definition This element represents the aggregate cost of investments accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + 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 Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
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- Definition Fair value portion of mortgage loans held-for-sale. + References No definition available. + Details
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- Definition The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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