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Goodwill - Schedule of Goodwill Allocated to Operating Segments (Details) - USD ($) $ in Millions	Sep. 30, 2025	Sep. 30, 2024
Goodwill [Line Items]
Goodwill	$ 298.3	$ 61.0
Commercial
Goodwill [Line Items]
Goodwill	115.6	35.5
Institutional
Goodwill [Line Items]
Goodwill	167.0	9.8
Self-Directed/Retail
Goodwill [Line Items]
Goodwill	5.7	5.7
Payments
Goodwill [Line Items]
Goodwill	$ 10.0	$ 10.0

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- Definition

Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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