v3.26.1
Derivatives and Hedging Activities - Derivative Instruments, Gain (Loss) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Interest income | Loans HFI    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain/(Loss) on Swaps $ 9.9 $ (63.7)
Gain/(Loss) on Hedged Item (9.9) 63.9
Interest income | Investment securities - AFS    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain/(Loss) on Swaps (22.7) 0.0
Gain/(Loss) on Hedged Item 23.5 0.0
Interest expense on qualifying debt    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain/(Loss) on Swaps (2.4) 0.0
Gain/(Loss) on Hedged Item $ 2.4 $ 0.0