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SECURITIZATIONS AND VARIABLE INTEREST ENTITIES - Mortgage Securitizations (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Mortgage securitizations - U.S. agency sponsored |  |  |  |  |
Cash Flows Between Transferor and Transferee |  |  |  |  |
Principal securitized | $ 1,500.0 | $ 2,900.0 | $ 4,900.0 | $ 5,800.0 |
Proceeds from new securitizations | 1,600.0 | 3,000.0 | 5,100.0 | 6,000.0 |
Contractual servicing fees received | 0.0 | 0.0 | 100.0 | 100.0 |
Cash flows received on retained interests and other net cash flows | 0.0 | 0.0 | 0.0 | 0.0 |
Purchases of previously transferred financial assets | 0.0 | 0.0 | 0.0 | 100.0 |
Gains recognized on the securitization | 1.0 | 1.0 | 1.0 | 1.0 |
Carrying value of retained interests | 789.0 |  | 789.0 |  | $ 783.0
Mortgage securitizations - Non-agency-sponsored |  |  |  |  |
Cash Flows Between Transferor and Transferee |  |  |  |  |
Principal securitized | 2,900.0 | 2,700.0 | 5,700.0 | 6,800.0 |
Proceeds from new securitizations | 1,600.0 | 2,700.0 | 3,900.0 | 6,400.0 |
Contractual servicing fees received | 0.0 | 0.0 | 0.0 | 0.0 |
Cash flows received on retained interests and other net cash flows | 100.0 | 0.0 | 200.0 | 100.0 |
Purchases of previously transferred financial assets | 0.0 | 0.0 | 0.0 | 0.0 |
Gains recognized on the securitization | 69.2 | $ 44.8 | 164.8 | $ 126.8 |
Senior interests |  |  |  |  |
Cash Flows Between Transferor and Transferee |  |  |  |  |
Carrying value of retained interests | 908.0 |  | 908.0 |  | 902.0
Subordinated interests |  |  |  |  |
Cash Flows Between Transferor and Transferee |  |  |  |  |
Carrying value of retained interests | $ 1,023.0 |  | $ 1,023.0 |  | $ 1,058.0

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- Definition Cash Flows between a transferor and a transferee attributable to newly transferred assets related to either a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-3 + Details
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- Definition Cash Flows between a transferor and a transferee attributable to purchases of previously transferred financial assets (or its underlying collateral) related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-3 + Details
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- Definition Cash Flows between a transferee and a transferor attributable to servicing fees related to a securitization, asset-backed financing arrangement, or similar transfer in which the transferor has continuing involvement with the transferred financial assets underlying the transaction (including, but not limited to, servicing, recourse, and restrictions on transferor's interests in the transferred financial assets). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d)(4) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-3 + 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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