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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain (loss) on sales of loans, net $ (53.4) $ 153.3 $ 130.1
Change in fair value of IRLCs (17.4) (6.2) 17.5
Change in fair value of loans held for sale (5.9) 1.9 2.3
Gain (loss) on economic hedge instruments 101.7 1.5 (10.1)
Other (3.0) (4.7) (2.6)
Gain on loans held for sale, net 22.0 145.8 137.2
Intersegment Eliminations      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain on loans held for sale, net (15.7) (25.3) 17.4
Gains on derivatives (15.7) (25.3)  
Intersegment Eliminations | Economic Hedge      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gains on derivatives 15.7 25.3 (17.4)
MSRs Retained on Transfers of Forward Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain (loss) on sales of loans, net 234.7 222.7 68.7
Forward Mortgage Loans      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Gain (loss) on sales of loans, net (278.0) (87.8) 45.5
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]      
Gain (loss) on sales of loans, net (10.1) $ 18.4 $ 15.9
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