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Derivative Financial Instruments and Hedging Activities - Summary of Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Derivative [Line Items]      
Notional balance $ 3,252.9   $ 3,978.7
Derivatives, at fair value 11.9   21.6
Derivative liability, notional amount 2,782.7   920.2
Derivative liability, fair value (7.1)   (7.0)
Gains (losses) on derivatives (49.3) $ 3.5  
Forward Sales Of Reverse Loans      
Derivative [Line Items]      
Notional balance 40.0   0.0
Derivatives, at fair value 0.2   0.0
Derivative liability, notional amount 0.0   50.0
Derivative liability, fair value 0.0   (0.1)
Gains (losses) on derivatives 0.3 0.0  
Forward loans IRLCs      
Derivative [Line Items]      
Notional balance 1,176.6   592.5
Derivatives, at fair value 4.5   5.1
Gains (losses) on derivatives (0.6) 5.7  
Reverse loans IRLCs      
Derivative [Line Items]      
Notional balance 25.5   22.1
Derivatives, at fair value 0.6   0.6
Gains (losses) on derivatives 0.0 (0.1)  
TBA forward MBS trades      
Derivative [Line Items]      
Notional balance 1,665.7   1,818.6
Derivatives, at fair value 5.9   10.1
Derivative liability, notional amount 2,097.7   854.9
Derivative liability, fair value (5.3)   (6.8)
Interest Rate Swap      
Derivative [Line Items]      
Notional balance 215.0   790.0
Derivatives, at fair value 0.7   3.9
Derivative liability, notional amount 635.0   0.0
Derivative liability, fair value (1.4)   0.0
Interest rate option contracts      
Derivative [Line Items]      
Notional balance 0.0   750.0
Derivatives, at fair value 0.0   1.9
TBA Forward Pipelines Trades      
Derivative [Line Items]      
Gains (losses) on derivatives 4.9 (16.4)  
Interest Rate Swap Futures And TBA Forward MBS Trades      
Derivative [Line Items]      
Gains (losses) on derivatives (53.7) 14.1  
Other      
Derivative [Line Items]      
Derivative liability, notional amount 0.0   15.3
Derivative liability, fair value 0.0   (0.1)
Other Derivatives      
Derivative [Line Items]      
Gains (losses) on derivatives 0.0 0.3  
Forward Trades      
Derivative [Line Items]      
Notional balance 130.0   5.5
Derivatives, at fair value 0.1   0.0
Derivative liability, notional amount 50.0   0.0
Derivative liability, fair value (0.3)   $ 0.0
Forward LHFS Trades      
Derivative [Line Items]      
Gains (losses) on derivatives $ (0.3) $ 0.0