Income Taxes (Details 2) (USD $) In Millions	Sep. 30, 2011	Sep. 30, 2010
Current deferred income tax assets:
Compensation and benefits	$ 26.1	$ 22.0
Product warranty costs	14.1	14.0
Inventory	57.3	50.8
Allowance for doubtful accounts	15.2	14.6
Deferred credits	9.4	10.5
Returns, rebates and incentives	44.3	34.2
Self-insurance reserves	2.2	2.5
Restructuring reserves	1.1	2.4
Net operating loss carryforwards	1.6	1.6
U.S. federal tax credit carryforwards	8.4	0.7
State tax credit carryforwards	0	0.3
Other - net	19.9	16.6
Current deferred income tax assets	199.6	170.2
Long-term deferred income tax assets (liabilities):
Retirement benefits	335.4	316.9
Property	(80.3)	(75.5)
Intangible assets	(28.9)	(24.0)
Environmental reserves	11.9	12.9
Share-based compensation	33.6	36.9
Self-insurance reserves	5.7	6.2
Deferred gains	3.8	4.3
Net operating loss carryforwards	41.6	44.2
Capital loss carryforwards	18.3	11.7
US federal tax credit carryforwards	1.5	1.5
State tax credit carryforwards	3.5	2.5
Other - net	22.9	13.6
Subtotal	369.0	351.2
Valuation allowance	(32.8)	(26.7)
Net long-term deferred income tax assets	336.2	324.5
Total deferred income tax assets	$ 535.8	$ 494.7