Supplemental Financial Statement Information, Supplemental Financial Information (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2022
Income Statement Related Disclosures [Abstract]
Gain on finance lease termination			$ 0.0	$ (4.5)
Total Other items, net	$ 5.2	$ (3.5)	4.6	2.7
Inventories
Raw materials and supplies	145.5		145.5		$ 115.9
Work in process	300.2		300.2		201.6
Finished products	319.7		319.7		454.1
Total inventories	765.4		765.4		771.6
Other Current Assets
Miscellaneous receivables	27.1		27.1		29.9
Prepaid expenses	126.6		126.6		90.9
Value added tax collectible from customers	28.3		28.3		27.7
Other	33.5		33.5		42.9
Total other current assets	215.5		215.5		191.4
Property, Plant and Equipment
Land	13.0		13.0		14.4
Buildings	124.9		124.9		120.7
Machinery and equipment	850.4		850.4		828.2
Construction in progress	46.4		46.4		50.1
Finance Leases	39.3		39.3		39.0
Total gross property	1,074.0		1,074.0		1,052.4
Accumulated depreciation	(722.2)		(722.2)		(690.3)
Total property, plant and equipment, net	351.8		351.8		362.1
Other Current Liabilities
Accrued advertising, sales promotion and allowances	17.4		17.4		13.4
Accrued trade allowances	45.2		45.2		57.7
Accrued freight and warehousing	33.4		33.4		37.2
Accrued salaries, vacations and incentive compensation	49.0		49.0		60.6
Accrued interest expense	11.6		11.6		20.5
Restructuring reserve	1.4		1.4		1.7
Income taxes payable	57.3		57.3		36.7
Other	95.8		95.8		106.1
Total other current liabilities	311.1		311.1		333.9
Other Liabilities
Pensions and other retirement benefits	49.0		49.0		49.3
Deferred compensation	18.2		18.2		19.8
Restructuring reserve	5.0		5.0		0.0
Mandatory transition tax	13.1		13.1		16.7
Other non-current liabilities	49.5		49.5		52.3
Total other liabilities	134.8		134.8		$ 138.1
Nonoperating Income (Expense)
Income Statement Related Disclosures [Abstract]
Interest income	(0.4)	(0.2)	(1.7)	(0.7)
Foreign currency exchange loss	5.1	2.5	8.6	3.7
Pension cost/(benefit) other than service costs	0.7	(1.0)	2.0	(3.2)
Exit of Russian market	0.0	0.0	0.0	7.5
Gain on finance lease termination	0.0	(4.5)	0.0	(4.5)
Other	(0.2)	(0.3)	(4.3)	(0.1)
Total Other items, net	$ 5.2	$ (3.5)	$ 4.6	$ 2.7