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Reverse Mortgages - Schedule of Reverse Mortgage Revenue, Net (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Nov. 01, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Receivables [Abstract] |  |  |  |  |
Acquisition | $ 2,900.0 |  |  |  |
Loans Held For Investment, Reverse Mortgages, Acquisitions, Cash Amount | 20.0 |  |  |  |
Loans Held For Investment, Reverse Mortgages, UPB | $ 14.2 |  |  |  |
Gain on new originations |  | $ 5.4 | $ 5.5 | $ 16.5 | $ 16.5
Net interest income (servicing fee) |  | 7.8 | 6.2 | 24.2 | 18.2
Other change in fair value of securitized loans held for investment and HMBS-related borrowings, net |  | (1.2) | 5.7 | 5.3 | 5.0
Change in fair value included in earnings, net |  | 12.0 | 17.3 | 45.9 | 39.7
Loan fees and other |  | 1.0 | 0.7 | 2.8 | 2.2
Gain on reverse loans held for investment and HMBS-related borrowings, net |  | 13.0 | 18.0 | 48.7 | 41.9
Change in fair value |  | 178.6 | 162.4 | 553.1 | 496.8
Change in fair value |  | $ (166.5) | $ (145.0) | $ (507.2) | $ (457.1)

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- Definition Change in fair value related to home equity conversion mortgage-backed securities related borrowings accounted for as a financing. + References No definition available. + Details
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- Definition A gain (loss) realized on a transfer, accounted for as a sale, of all or a portion of financial assets in which the transferor surrenders control and receives consideration other than a beneficial interest in the assets transferred. Reflects the amount of sales proceeds in excess of, or deficient from, the sum of the carrying amounts of transferred financial assets plus transaction costs. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(9)(a)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-3 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 + Details
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