Restructuring Charges (Schedule of Restructuring and Related Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring and related costs	$ 53.1	$ 36.0	$ 17.1
Restructuring reserve	16.7	21.4
Restructuring charges	47.9	35.9	16.6
Operating Model Redesign
Restructuring Cost and Reserve [Line Items]
Severance Costs	6.8	10.2	6.2
Accelerated depreciation	1.7	0.6	0.8
Consulting, project implementation and management and other exit costs	10.6	9.6	10.1
Restructuring reserve	2.7
Restructuring charges	19.1	20.4	17.1
Consolidation of Mexico Facilities
Restructuring Cost and Reserve [Line Items]
Severance Costs	0.3	15.6
Accelerated depreciation	4.1	0.0
Consulting, project implementation and management and other exit costs	29.6	0.0
Restructuring reserve	14.0
Restructuring charges	34.0	15.6
Severance and related benefit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges, charge to income	7.1	26.4
Utilized - non cash	(1.9)
Utilized - cash payments	(9.9)	(9.6)
Restructuring reserve	16.0	20.7	3.9
Severance and related benefit costs | Operating Model Redesign
Restructuring Cost and Reserve [Line Items]
Restructuring charges, charge to income	6.8	10.8
Utilized - non cash	(1.3)
Utilized - cash payments	(7.9)	(9.6)
Restructuring reserve	2.7	5.1	3.9
Severance and related benefit costs | Consolidation of Mexico Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges, charge to income	0.3	15.6
Utilized - non cash	(0.6)
Utilized - cash payments	(2.0)	0.0
Restructuring reserve	13.3	15.6	0.0
Other exit costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges, charge to income	40.2	9.6
Utilized - non cash	(1.5)
Utilized - cash payments	(38.7)	(9.6)
Restructuring reserve	0.7	0.7	0.7
Other exit costs | Operating Model Redesign
Restructuring Cost and Reserve [Line Items]
Restructuring charges, charge to income	10.6	9.6
Utilized - non cash	(0.7)
Utilized - cash payments	(10.6)	(9.6)
Restructuring reserve	0.0	0.7	0.7
Other exit costs | Consolidation of Mexico Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges, charge to income	29.6	0.0
Utilized - non cash	(0.8)
Utilized - cash payments	(28.1)	0.0
Restructuring reserve	0.7	$ 0.0	$ 0.0
Asset impairment and accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Restructuring charges, charge to income	5.8
Utilized - non cash	(5.8)
Asset impairment and accelerated depreciation | Operating Model Redesign
Restructuring Cost and Reserve [Line Items]
Restructuring charges, charge to income	1.7
Utilized - non cash	(1.7)
Asset impairment and accelerated depreciation | Consolidation of Mexico Facilities
Restructuring Cost and Reserve [Line Items]
Restructuring charges, charge to income	4.1
Utilized - non cash	$ (4.1)