Supplemental Information (Related Party Transactions) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Related Party Transaction [Line Items]
Sales and other income	$ 105.0	$ 75.0	$ 290.0	$ 200.0
Trade receivables, net	1,934.2		1,934.2		$ 1,794.4
Related Party
Related Party Transaction [Line Items]
Trade receivables, net	$ 255.0		$ 255.0		$ 55.0

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
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-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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