Supplemental Information (Related Party Transactions) (Details) - USD ($) $ in Millions	3 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Sep. 30, 2023
Related Party Transaction [Line Items]
Sales and other income	$ 95.0	$ 80.0
Trade receivables, net	1,725.4		$ 1,700.4
Current portion of long-term debt	218.0		615.0
Related Party
Related Party Transaction [Line Items]
Trade receivables, net	90.0		80.0
Total Debt	294.8		328.3
Current portion of long-term debt	$ 136.9		$ 177.6

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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