Supplementary Balance Sheet Information (Details) - USD ($) $ in Millions	Mar. 31, 2017	Sep. 30, 2016
Balance Sheet Related Disclosures [Abstract]
Allowance for possible losses and discounts on trade receivables	$ 28.9	$ 26.8
Inventories:
Finished products	142.2	124.2
Raw materials and work in process	121.9	127.8
Total inventory	264.1	252.0
Accumulated depreciation of property, plant and equipment	626.6	611.8
Accumulated amortization of software and other intangible assets	$ 453.4	$ 398.3
Preferred stock, without par value:
Shares authorized	1,000,000	1,000,000
Shares issued	0	0
Common stock, without par value:
Shares authorized	199,000,000	199,000,000
Shares issued (in shares)	88,457,634.000000	88,457,634
Shares outstanding (in shares)	65,766,257.000000	65,705,253
Treasury shares (in shares)	22,691,377.000000	22,752,381