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Mortgage Servicing - Schedule of Composition of Servicing UPB (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Servicing Assets at Fair Value [Line Items]        
Servicing Asset at Fair Value, Amount $ 2,466.3 $ 2,272.2 $ 2,665.2 $ 2,250.1
UPB 170,300.0 169,700.0    
UPB of loans transferred 49,641.2 46,810.1    
Owned Mortgage Servicing Rights        
Servicing Assets at Fair Value [Line Items]        
Servicing Asset at Fair Value, Amount 1,869.6 1,604.6    
MAV Transferred Mortgage Servicing Rights        
Servicing Assets at Fair Value [Line Items]        
Servicing Asset at Fair Value, Amount 330.6 422.8    
Fair Value GSE Mortgage Servicing Rights        
Servicing Assets at Fair Value [Line Items]        
Servicing Asset at Fair Value, Amount 1,902.5 1,773.9    
UPB 129,300.0 127,300.0    
Fair Value of GNMA Mortgage Servicing Rights        
Servicing Assets at Fair Value [Line Items]        
Servicing Asset at Fair Value, Amount 351.6 277.1    
UPB 19,400.0 18,600.0    
Fair Value Non Agency Mortgage Servicing Rights        
Servicing Assets at Fair Value [Line Items]        
Servicing Asset at Fair Value, Amount 212.2 221.2    
UPB $ 21,600.0 $ 23,800.0