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Goodwill - Goodwill by Segment (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | ---
Goodwill [Line Items] |  |
Total Goodwill | $ 59.3 | $ 59.3
Commercial |  |
Goodwill [Line Items] |  |
Total Goodwill | 33.7 | 33.7
Institutional |  |
Goodwill [Line Items] |  |
Total Goodwill | 9.8 | 9.8
Retail |  |
Goodwill [Line Items] |  |
Total Goodwill | 5.8 | 5.8
Payments |  |
Goodwill [Line Items] |  |
Total Goodwill | $ 10.0 | $ 10.0

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