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Mortgage Servicing - Schedule of Composition of Servicing UPB (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | ---
Servicing Assets at Fair Value [Line Items] |  |  |  |  |
MSRs, at fair value | $ 2,327.7 | $ 2,374.7 | $ 2,272.2 | $ 2,580.6 | $ 2,665.2
Assets serviced | 162,900.0 |  | 169,700.0 |  |
UPB of loans transferred | 47,658.7 |  | 46,810.1 |  |
Owned MSRs |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |
MSRs, at fair value | 1,720.1 |  | 1,604.6 |  |
Assets serviced | 122,000.0 |  | 122,700.0 |  |
MAV Transferred MSRs |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |
MSRs, at fair value | 343.6 |  | 422.8 |  |
Assets serviced | $ 22,300.0 |  | $ 28,800.0 |  |

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