Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Jun. 30, 2018	Sep. 30, 2017
Inventories
Raw materials and supplies	$ 47.0	$ 50.6
Work in process	60.4	60.9
Finished products	234.0	222.0
Total inventories	341.4	333.5
Other Current Assets
Miscellaneous receivables	15.2	16.9
Prepaid expenses	77.4	55.6
Value added tax collectible from customers	26.9	25.2
Income taxes receivable	11.0	24.7
Other	4.8	3.3
Total other current assets	135.3	125.7
Property, Plant and Equipment
Land	19.2	19.3
Buildings	142.4	139.1
Machinery and equipment	960.6	947.4
Capitalized software costs	48.3	42.3
Construction in progress	51.7	49.7
Total gross property	1,222.2	1,197.8
Accumulated depreciation	(794.7)	(744.4)
Total property, plant and equipment, net	427.5	453.4
Other Current Liabilities
Accrued advertising, sales promotion and allowances	49.4	32.2
Accrued trade allowances	24.7	24.6
Accrued salaries, vacations and incentive compensation	46.6	40.6
Income taxes payable	24.2	18.3
Returns reserve	49.8	53.3
Restructuring reserve	10.1	3.0
Value added tax payable	7.8	5.8
Deferred compensation	4.7	13.8
Other	79.7	89.8
Total other current liabilities	297.0	281.4
Other Liabilities
Pensions and other retirement benefits	97.2	109.4
Deferred compensation	43.0	47.3
Long-term income taxes payable	36.1	0.0
Other non-current liabilities	58.2	58.8
Total other liabilities	$ 234.5	$ 215.5