Business Segment Information (Reconciliation of Operating Income) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Segment Reporting Information [Line Items]
Operating income (loss)	$ 737.6	$ 644.2	$ 2,041.7	$ 1,756.0
Business and asset actions	0.0	(59.0)	(57.0)	(244.6)
Segment Reconciling Items
Segment Reporting Information [Line Items]
Business and asset actions	0.0	(59.0)	(57.0)	(244.6)
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	$ 737.6	$ 703.2	$ 2,098.7	$ 2,000.6