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Loans Held for Sale - Summary of Activity in Balance of Loans Held for Sale, at Fair Value (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Receivables [Abstract]      
Principal amount outstanding on loans held for sale $ 678.8 $ 623.7  
Premium (discount) balance on loans held for sale (2.4) 7.4  
Fair value adjustment to loans held for sale (2.2) (13.3)  
Mortgages Held-for-sale, Fair Value Disclosure 674.2 617.8  
Movement In Loans Held For Sale At Fair Value [Roll Forward]      
Beginning balance 617.8 917.5 $ 366.4
Originations and purchases 12,797.5 17,582.0 19,972.4
Proceeds from sales (12,450.8) (17,477.2) (19,279.2)
Principal collections (87.5) (106.9) (58.6)
Transfer of Portfolio Loans and Leases to Held-for-sale 6.1 8.0 4.3
Transfer Of Portfolio Loans To Receivables (33.2) (13.2) (33.6)
Real estate owned (Other assets) (19.4) (3.1) (8.4)
Transfer Of Portfolio Loans To Real Estate Owned (19.4) (3.1) (8.4)
Transfer To Receivables (33.2) (13.2) (33.6)
Capitalization of advances on Ginnie Mae modifications 6.4 18.1 24.8
Fair value gain (loss) on loans held for sale (165.7) (294.0) (67.5)
Other 2.8 (13.4) (2.9)
Ending balance 674.2 617.8 917.5
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Mortgages Held-for-sale, Fair Value Disclosure 674.2 617.8  
Loans Held-for-sale, Fair Value Disclosure 674.2 617.8 917.5
Transfer Of Portfolio Loans To Real Estate Owned 19.4 3.1 8.4
Transfer Of Portfolio Loans To Receivables (33.2) (13.2) $ (33.6)
Variable Interest Entity, Primary Beneficiary | Warehouse Mortgage Loan Financing Facility      
Receivables [Abstract]      
Mortgages Held-for-sale, Fair Value Disclosure 119.5    
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Mortgages Held-for-sale, Fair Value Disclosure 119.5    
GSE Loans      
Movement In Loans Held For Sale At Fair Value [Roll Forward]      
Beginning balance 318.3    
Ending balance 219.3 318.3  
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Held-for-sale, Fair Value Disclosure 219.3 318.3  
Government Forward Loans      
Movement In Loans Held For Sale At Fair Value [Roll Forward]      
Beginning balance 150.2    
Ending balance 254.0 150.2  
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Held-for-sale, Fair Value Disclosure 254.0 150.2  
Repurchased Ginnie Mae Loans      
Movement In Loans Held For Sale At Fair Value [Roll Forward]      
Beginning balance 32.1    
Ending balance 19.1 32.1  
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Held-for-sale, Fair Value Disclosure 19.1 32.1  
Reverse Loans      
Movement In Loans Held For Sale At Fair Value [Roll Forward]      
Beginning balance 102.5    
Ending balance 166.6 102.5  
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Held-for-sale, Fair Value Disclosure 166.6 102.5  
Residential Mortgage Backed Securities      
Movement In Loans Held For Sale At Fair Value [Roll Forward]      
Beginning balance 14.8    
Ending balance 15.2 14.8  
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans Held-for-sale, Fair Value Disclosure $ 15.2 $ 14.8