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Goodwill - Goodwill by Segment (Details) - USD ($) $ in Millions | Mar. 31, 2023 | Sep. 30, 2022
--- | --- | ---
Goodwill [Line Items] |  |
Total Goodwill | $ 59.4 | $ 58.2
Commercial |  |
Goodwill [Line Items] |  |
Total Goodwill | 33.8 | 32.6
Institutional |  |
Goodwill [Line Items] |  |
Total Goodwill | 9.8 | 9.8
Retail |  |
Goodwill [Line Items] |  |
Total Goodwill | 5.8 | 5.8
Global Payments |  |
Goodwill [Line Items] |  |
Total Goodwill | $ 10.0 | $ 10.0

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