Supplemental Information (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Related Party Transaction [Line Items]
Trade receivables, net	$ 1,821.6	$ 1,700.4
Related Party
Related Party Transaction [Line Items]
Sales and other income	350.0	380.0	$ 300.0
Trade receivables, net	$ 120.0	$ 80.0

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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