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Other Assets - Software, Net (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |
Capitalized internal-use software, accumulated amortization | $ 39.8 | $ 43.6 |
Capitalized internal-use software, net book value | 15.1 | 13.3 |
Hosting arrangements |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |
Capitalized internal-use software, accumulated amortization | 7.7 | 0.6 |
Capitalized internal-use software, net book value | 110.5 | 77.7 |
Other noninterest expense |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |
Amortization expense for all capitalized implementation costs | 5.4 | 8.6 | $ 6.4
Equipment expense | Hosting arrangements |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |
Amortization expense for all capitalized implementation costs | 7.2 | 0.5 | $ 0.1
Included in other assets |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |
Total capitalized internal-use software | 54.9 | 56.9 |
Included in other assets | Hosting arrangements |  |  |
Research and Development Arrangement, Contract to Perform for Others [Line Items] |  |  |
Total capitalized internal-use software | $ 118.2 | $ 78.3 |

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