Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Sep. 30, 2011
Current deferred income tax assets:
Compensation and benefits	$ 28.7	$ 26.1
Product warranty costs	14.3	14.1
Inventory	58.4	57.3
Allowance for doubtful accounts	15.6	15.2
Deferred credits	9.5	9.4
Returns, rebates and incentives	47.5	44.3
Self-insurance reserves	2.7	2.2
Restructuring reserves	2.4	1.1
Net operating loss carryforwards	3.7	1.6
U.S. federal tax credit carryforwards	0	8.4
State tax credit carryforwards	0.9	0
Other - net	24.9	19.9
Current deferred income tax assets	208.6	199.6
Long-term deferred income tax assets (liabilities):
Retirement benefits	369.3	335.4
Property	(90.3)	(80.3)
Intangible assets	(34.1)	(28.9)
Environmental reserves	13.7	11.9
Share-based compensation	40.1	33.6
Self-insurance reserves	6.2	5.7
Deferred gains	3.3	3.8
Net operating loss carryforwards	38.5	41.6
Capital loss carryforwards	17.2	18.3
US federal tax credit carryforwards	1.5	1.5
State tax credit carryforwards	3.4	3.5
Other - net	14.1	22.9
Subtotal	382.9	369.0
Valuation allowance	(31.8)	(32.8)
Net long-term deferred income tax assets	351.1	336.2
Total deferred income tax assets	$ 559.7	$ 535.8