Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Current deferred income tax assets:
Compensation and benefits	$ 26.4	$ 28.7
Product warranty costs	13.0	14.3
Inventory	48.0	58.4
Allowance for doubtful accounts	9.8	15.6
Deferred credits	9.3	9.5
Returns, rebates and incentives	49.7	47.5
Self-insurance reserves	2.5	2.7
Restructuring reserves	3.1	2.4
Net operating loss carryforwards	3.7	3.7
State tax credit carryforwards	0	0.9
Other - net	24.0	24.9
Current deferred income tax assets	189.5	208.6
Long-term deferred income tax assets (liabilities):
Retirement benefits	177.4	369.3
Property	(88.5)	(90.3)
Intangible assets	(40.2)	(34.1)
Environmental reserves	18.0	13.7
Share-based compensation	33.8	40.1
Self-insurance reserves	7.0	6.2
Deferred gains	2.8	3.3
Net operating loss carryforwards	37.6	38.5
Capital loss carryforwards	14.2	17.2
US federal tax credit carryforwards	2.1	1.5
State tax credit carryforwards	4.7	3.4
Other - net	6.7	14.1
Subtotal	175.6	382.9
Valuation allowance	(28.3)	(31.8)
Net long-term deferred income tax assets	147.3	351.1
Total deferred income tax assets	$ 336.8	$ 559.7