Business Segment Information (Reconciliation of Operating Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Operating income (loss)	$ 644.2	$ 627.4	$ 1,756.0	$ 1,712.3
Business and asset actions	(59.0)	0.0	(244.6)	0.0
Segment Reconciling Items
Segment Reporting Information [Line Items]
Business and asset actions	(59.0)	0.0	(244.6)	0.0
Segment Total
Segment Reporting Information [Line Items]
Operating income (loss)	$ 703.2	$ 627.4	$ 2,000.6	$ 1,712.3