Income Taxes (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Current deferred income tax assets:
Compensation and benefits	$ 33.7	$ 26.4
Product warranty costs	12.3	13.0
Inventory	18.3	48.0
Allowance for doubtful accounts	8.8	9.8
Deferred credits	7.5	9.3
Returns, rebates and incentives	54.5	49.7
Self-insurance reserves	0.9	2.5
Restructuring reserves	2.1	3.1
Net operating loss carryforwards	3.5	3.7
U.S. federal tax credit carryforward	0.2	0
Other - net	21.7	24.0
Current deferred income tax assets	163.5	189.5
Long-term deferred income tax assets (liabilities):
Retirement benefits	240.4	177.4
Property	(81.9)	(88.5)
Intangible assets	(50.2)	(40.2)
Environmental reserves	16.9	18.0
Share-based compensation	32.6	33.8
Self-insurance reserves	7.9	7.0
Deferred gains	2.4	2.8
Net operating loss carryforwards	31.9	37.6
Capital loss carryforwards	14.8	14.2
US federal tax credit carryforwards	1.3	2.1
State tax credit carryforwards	5.8	4.7
Other - net	11.6	6.7
Subtotal	233.5	175.6
Valuation allowance	(27.8)	(28.3)
Net long-term deferred income tax assets	205.7	147.3
Total deferred income tax assets	$ 369.2	$ 336.8