Accounts Receivable Facility (Narrative) (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
Accounts receivable sales agreement
Transfer of Financial Assets Accounted for as Sales [Line Items]
Loss on sale of accounts receivable	$ 1.8	$ 2.1	$ 4.6	$ 4.5
Accounts receivable sales agreement
Transfer of Financial Assets Accounted for as Sales [Line Items]
Accounts receivable sold through AR Facility	353.5	$ 388.7	886.0	$ 916.3
Transfer of accounts receivable, sales amount derecognized	$ 158.5		$ 158.5		$ 82.1