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Fair Value - Schedule of Estimated Change in Fair Value of MSRs (Details)
$ in Millions
Sep. 30, 2024
USD ($)
Fair Value Disclosures [Abstract]  
Weighted average prepayment speeds, 10% $ (60.4)
Weighted average prepayment speeds, 20% (118.3)
Weighted average discount rate, 10% (68.7)
Weighted average discount rate, 20% $ (132.3)
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Prepayment Speed, Percent 0.008
ensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Prepayment Speed, Percent 0.017
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 10 Percent Adverse Change in Discount Rate, Percent 0.009
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of 20 Percent Adverse Change in Discount Rate, Percent 0.019