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Securitizations and Variable Interest Entities - Schedule of Assets That Relate to Continuing Involvement with Transferred Financial Assets with Servicing Rights and Maximum Exposure to Loss Including the Unpaid Principal Balance (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |
UPB of loans transferred | $ 52,545.6 | $ 49,641.2
Maximum exposure to loss | 53,422.2 | 50,505.0
GinnieMae |  |
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |
UPB of loans transferred | 12,000.0 | 11,700.0
Mortgage Servicing Rights - Fair Value |  |
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |
Carrying value of assets | 759.7 | 734.2
Advances |  |
Qualitative and Quantitative Information, Transferor's Continuing Involvement [Line Items] |  |
Carrying value of assets | $ 116.9 | $ 129.6

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