Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010
Trade Receivables
Reserve for trade receivables	$ 16.5	$ 21.7
Inventories:
Percentage of inventories determined by LIFO method	48.00%	54.00%
Raw materials and components	39.1	36.0
Work in process	13.9	10.8
Finished goods	37.0	36.9
Total inventories	90.0	83.7
Difference in valuation if the FIFO method of inventory accounting had been used for all inventories	13.8	12.8
Properties
Cost	381.8	376.8
Accumulated Depreciation	(263.9)	(256.2)
Depreciation expense	18.7	19.1	17.2
Land and land improvements
Properties
Cost	16.8	15.5
Accumulated Depreciation	(3.5)	(3.5)
Buildings and building equipment
Properties
Cost	92.5	99.1
Accumulated Depreciation	(55.5)	(56.7)
Buildings and building equipment | Minimum
Properties
Estimated useful lives	6 years
Buildings and building equipment | Maximum
Properties
Estimated useful lives	40 years
Machinery and equipment
Properties
Cost	272.5	262.2
Accumulated Depreciation	$ (204.9)	$ (196.0)
Machinery and equipment | Minimum
Properties
Estimated useful lives	3 years
Machinery and equipment | Maximum
Properties
Estimated useful lives	10 years