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Loans Held for Sale - Summary of Activity in Gain on Loans Held for Sale, Net (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gain On Sale Of Loans Including Value Assigned To MSRs Retained | $ 17.3 | $ (59.3) | $ 155.2
Change in fair value of IRLCs | 6.4 | (17.4) | (6.2)
Change in fair value of loans held for sale (4) | 15.9 | (5.9) | 1.9
Gain (loss) on economic hedge instruments | 18.6 | 101.7 | 1.5
Provision for representation and warranty obligations | (1.7) | (3.0) | (4.7)
Gain on loans held for sale, net | 40.6 | 22.0 | 145.8
Change In Fair Value Of Mortgage Loans Held For Sale, Revaluation Gain (Loss) | 10.9 |  |
Intersegment Eliminations |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gain on loans held for sale, net | 0.0 | (15.7) | (25.3)
Gains on derivatives |  | (15.7) |
Intersegment Eliminations | Economic Hedge |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Gains on derivatives | 0.0 | 15.7 | 25.3
MSRs Retained on Transfers of Forward Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Debt and Equity Securities, Gain (Loss) | 183.0 | 234.7 | 222.7
Forward Mortgage Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Debt and Equity Securities, Gain (Loss) | (178.8) | (278.0) | (87.8)
Financing Receivable, Amount Purchased with Credit Deterioration, Gain (Loss) on Loan |  |  | 27.1
Repurchased Ginnie Mae Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Debt and Equity Securities, Gain (Loss) | $ (2.7) | (10.1) | $ 18.4
Financing Receivable, Amount Purchased with Credit Deterioration, Gain (Loss) on Loan |  | 8.8 |
mpaired Financing Receivable, Unpaid Principal Balance, Net Of MSR Fair Value Adjustments |  | $ 299.7 |

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- Definition The increase (decrease) during the reporting period in the fair value of mortgage loans that are held with the intention to sell or be securitized in the near future. + References No definition available. + Details
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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
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