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Loans Held for Sale - Summary of Activity in Gain on Loans Held for Sale, Net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Change in fair value of loans held for sale (3) $ (14.7) $ 15.9 $ (5.9)
Gain On Sale Of Loans Including Value Assigned To MSRs Retained 31.4 17.3 (59.3)
Gain (loss) on economic hedge instruments 36.0 18.6 101.7
Change in fair value of IRLCs (5.8) 6.4 (17.4)
Provision for representation and warranty obligations (2.6) (1.7) (3.0)
Gain on loans held for sale, net 59.0 40.6 22.0
Change In Fair Value Of Mortgage Loans Held For Sale, Revaluation Gain (Loss)   10.9  
Intersegment Eliminations      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on loans held for sale, net 0.0 0.0 (15.7)
Intersegment Eliminations | Economic Hedge      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gains on derivatives 0.0   15.7
MSRs Retained on Transfers of Forward Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Debt and Equity Securities, Gain (Loss) 247.6 183.0 234.7
Forward Mortgage Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Debt and Equity Securities, Gain (Loss) (200.0) (178.8) (278.0)
Repurchased Ginnie Mae Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Debt and Equity Securities, Gain (Loss) $ (1.4) $ (2.7) (10.1)
Financing Receivable, Amount Purchased with Credit Deterioration, Gain (Loss) on Loan     8.8
mpaired Financing Receivable, Unpaid Principal Balance, Net Of MSR Fair Value Adjustments     $ 299.7