Supplementary Balance Sheet Information (Details) (USD $) In Millions, except Share data, unless otherwise specified	Dec. 31, 2012	Sep. 30, 2012
Supplementary Balance Sheet Information [Abstract]
Allowance for possible losses and discounts on trade receivables	$ 37.7	$ 38.5
Inventories:
Finished products	67.9	71.8
Raw materials and work in process	54.8	55.1
Total inventory	122.7	126.9
Accumulated depreciation of property, plant and equipment	573.3	584.8
Accumulated amortization of software and other intangible assets	$ 209.2	$ 198.8
Preferred stock, without par value:
Par value
Shares authorized	1,000,000	1,000,000
Common stock, without par value:
Par value
Shares authorized	199,000,000	199,000,000
Shares issued	80,323,912	80,323,912
Shares outstanding	60,319,088	60,796,923
Treasury shares	20,004,824	19,526,989