Accounts Receivable Facility (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024
Accounts receivable sales agreement
Transfer of Financial Assets Accounted for as Sales [Line Items]
Loss on sale of accounts receivable	$ 1.7	$ 1.8	$ 4.1	$ 4.6
Transfer of Accounts Receivable to Date	363.2	$ 353.5	887.8	$ 886.0
Accounts receivable sales agreement
Transfer of Financial Assets Accounted for as Sales [Line Items]
Transfer of accounts receivable, sales amount derecognized	$ 145.6		$ 145.6		$ 88.6