Income Taxes (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Pre-tax income (loss) from continuing operations
Domestic	$ 373.1	$ 412.5	$ 269.1
Foreign	58.8	32.5	40.1
Income from continuing operations before income taxes and equity in earnings of unconsolidated affiliates	431.9	445.0	309.2
Current:
Federal	118.8	154.5	118.9
Foreign	14.7	3.2	3.2
State	11.3	4.4	3.9
Total current	144.8	162.1	126.0
Deferred:
Federal	(8.5)	(30.3)	(60.8)
Foreign	(10.5)	0.8	2.0
State	(0.8)	(0.9)	(2.0)
Total deferred	(19.8)	(30.4)	(60.8)
Provision for income taxes	125.0	131.7	65.2
Allocated to Other Comprehensive Income (Loss)
Deferred federal, state and foreign	(12.4)	44.6	18.7
Effective Rate Reconciliation
U.S. federal tax rate	35.00%	35.00%	35.00%
State income taxes, net	2.10%	0.80%	(0.60%)
Foreign taxes	(1.40%)	(0.30%)	2.20%
Tax audit settlements	(2.30%)	0.30%	(3.80%)
European tax incentive	0.00%	(0.60%)	(1.60%)
Valuation allowance	(2.40%)	(0.70%)	(2.30%)
Domestic tax credits	(0.40%)	(1.30%)	(0.30%)
Manufacturing deduction	(2.20%)	(3.80%)	(3.40%)
Other, net	0.60%	0.20%	(4.10%)
Effective income tax rate	29.00%	29.60%	21.10%
Deferred tax assets:
Other long-term liabilities	88.5	74.0
Losses and credits	53.8	76.0
Accrued warranty	27.9	31.3
Other current liabilities	20.7	26.3
Payroll-related obligations	24.4	21.3
Receivables	7.1	7.8
Other	0.6	0
Gross deferred tax assets	223.0	236.7
Less valuation allowance	(26.1)	(52.1)
Deferred tax assets	196.9	184.6
Deferred tax liabilities:
Intangible assets	193.1	210.0
Property, plant and equipment	35.2	31.4
Inventories	6.8	14.3
Other	5.9	4.3
Deferred tax liabilities	241.0	260.0
Deferred Tax Liabilites, Net	(44.1)	(75.4)
Classification of deferred tax liability in consolidated balance sheets
Current net deferred tax asset	66.3	67.6
Deferred Tax Assets, Net, Noncurrent	14.6	0
Non-current net deferred tax liability	$ (125.0)	$ (143.0)