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Other Assets - Software, Net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Total capitalized implementation costs $ 0.0 $ 0.0  
Capitalized internal-use software, accumulated amortization 34.1 28.7  
Capitalized internal-use software, net book value 13.0 10.8  
Hosting arrangements      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Accumulated amortization 37.7 21.2  
Net book value 99.7 111.4  
Other noninterest expense      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Amortization expense for all capitalized implementation costs 5.4 5.0 $ 5.4
Equipment | Hosting arrangements      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Total amortization expense for all capitalized implementation costs 16.5 13.5 $ 7.2
Other Assets      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Total capitalized internal-use software 47.1 39.5  
Other Assets | Hosting arrangements      
Research and Development Arrangement, Contract to Perform for Others [Line Items]      
Total capitalized implementation costs $ 137.4 $ 132.6