Supplemental Information (Related Party Transactions) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2023
Related Party Transaction [Line Items]
Sales and other income	$ 80.0	$ 105.0	$ 255.0	$ 290.0
Trade receivables, net	1,712.2		1,712.2		$ 1,700.4
Related Party
Related Party Transaction [Line Items]
Trade receivables, net	$ 85.0		$ 85.0		$ 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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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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