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Loans Held for Sale - Summary of Activity in Balance of Loans Held for Sale, at Fair Value (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Receivables [Abstract] |  |  |
Principal amount outstanding on loans held for sale | $ 1,401.2 | $ 678.8 |
Premium (discount) balance on loans held for sale | (91.6) | (2.4) |
Fair value adjustment to loans held for sale | (19.4) | (2.2) |
Mortgages Held-for-sale, Fair Value Disclosure | 1,290.2 | 674.2 |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |
Beginning balance | 674.2 | 617.8 | $ 917.5
Originations and purchases | 17,811.4 | 12,797.5 | 17,582.0
Proceeds from sales | (16,857.8) | (12,450.8) | (17,477.2)
Principal collections | (102.1) | (87.5) | (106.9)
Transfer from loans held for investment to loans held for sale | 4.8 | 6.1 | 8.0
Transfer of Portfolio Loans and Leases to Held-for-sale |  | 6.1 | 8.0
Transfer Of Portfolio Loans To Receivables | (32.9) | (33.2) | (13.2)
Real estate owned (Other assets) | (26.8) | (19.4) | (3.1)
Transfer Of Portfolio Loans To Real Estate Owned | (26.8) | (19.4) | (3.1)
Transfer To Receivables | (32.9) | (33.2) | (13.2)
Capitalization of advances on Ginnie Mae modifications | 9.3 | 6.4 | 18.1
Fair value gain (loss) on loans held for sale | (216.2) | (165.7) | (294.0)
Other | 26.1 | 2.8 | (13.4)
Ending balance | 1,290.2 | 674.2 | 617.8
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgages Held-for-sale, Fair Value Disclosure | 1,290.2 | 674.2 |
Loans Held-for-sale, Fair Value Disclosure | 1,290.2 | 674.2 | 617.8
Transfer Of Portfolio Loans To Real Estate Owned | 26.8 | 19.4 | 3.1
Transfer Of Portfolio Loans To Receivables | (32.9) | (33.2) | $ (13.2)
Variable Interest Entity, Primary Beneficiary | Warehouse Mortgage Loan Financing Facility |  |  |
Receivables [Abstract] |  |  |
Mortgages Held-for-sale, Fair Value Disclosure | 375.4 | 119.5 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Mortgages Held-for-sale, Fair Value Disclosure | 375.4 | 119.5 |
GSE Loans |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |
Beginning balance | 219.3 |  |
Ending balance | 610.8 | 219.3 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans Held-for-sale, Fair Value Disclosure | 610.8 | 219.3 |
Government Forward Loans |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |
Beginning balance | 254.0 |  |
Ending balance | 215.5 | 254.0 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans Held-for-sale, Fair Value Disclosure | 215.5 | 254.0 |
Repurchased Ginnie Mae Loans |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |
Beginning balance | 19.1 |  |
Ending balance | 26.1 | 19.1 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans Held-for-sale, Fair Value Disclosure | 26.1 | 19.1 |
Reverse Loans |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |
Beginning balance | 166.6 |  |
Ending balance | 432.4 | 166.6 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans Held-for-sale, Fair Value Disclosure | 432.4 | 166.6 |
Residential Mortgage Backed Securities |  |  |
Movement In Loans Held For Sale At Fair Value [Roll Forward] |  |  |
Beginning balance | 15.2 |  |
Ending balance | 5.3 | 15.2 |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans Held-for-sale, Fair Value Disclosure | $ 5.3 | $ 15.2 |

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