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Basis of Presentation and Accounting Policies - Basis of Presentation (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Reclassification [Line Items]
Cost of product and service sold	$ 4,326.0	$ 4,413.0	$ 4,635.0
Segment engineering and development expenses	679.0	658.0	706.0
Revision of Prior Period, Reclassification, Adjustment
Reclassification [Line Items]
Cost of product and service sold	(679.0)	(658.0)	(706.0)
Segment engineering and development expenses	$ 482.0	$ 477.0	$ 530.0

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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