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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain On Sale Of Loans Including Value Assigned To MSRs Retained $ 17.3 $ (59.3) $ 155.2
Change in fair value of IRLCs 6.4 (17.4) (6.2)
Change in fair value of loans held for sale (4) 15.9 (5.9) 1.9
Gain (loss) on economic hedge instruments 18.6 101.7 1.5
Provision for representation and warranty obligations (1.7) (3.0) (4.7)
Gain on loans held for sale, net 40.6 22.0 145.8
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 (15.7) (25.3)
Gains on derivatives   (15.7)  
Intersegment Eliminations | Economic Hedge      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gains on derivatives 0.0 15.7 25.3
MSRs Retained on Transfers of Forward Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Debt and Equity Securities, Gain (Loss) 183.0 234.7 222.7
Forward Mortgage Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Debt and Equity Securities, Gain (Loss) (178.8) (278.0) (87.8)
Financing Receivable, Amount Purchased with Credit Deterioration, Gain (Loss) on Loan     27.1
Repurchased Ginnie Mae Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Debt and Equity Securities, Gain (Loss) $ (2.7) (10.1) $ 18.4
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