Business Segment Information (Reconciliation of Segment Operating Income to Consolidated Results) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Operating income (loss)	$ 734.5	$ 643.6
Business and asset actions	(22.0)	0.0
Shareholder activism-related costs	0.0	(29.9)
Equity affiliates' income	172.2	150.6
Interest expense	54.5	42.6
Other non-operating income (expense), net	(1.4)	38.9
Income Before Taxes	850.8	790.5
Operating Segments
Segment Reporting Information [Line Items]
Operating income (loss)	756.5	673.5
Equity affiliates' income	172.2	150.6
Segment Reconciling Items
Segment Reporting Information [Line Items]
Business and asset actions	(22.0)	0.0
Shareholder activism-related costs	$ 0.0	$ (29.9)