Income Taxes (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Income Tax Contingency [Line Items]
Gross Unrecognized Tax Benefits	$ 70.3	$ 75.1	$ 66.3	$ 116.7
Net Unrecognized Tax Benefits	23.3	30.2	15.2
Income Taxes (Textuals) [Abstract]
Net discrete tax benefits	2.1	25.0
Discrete tax benefits			27.2
Discrete tax expenses			9.6
Income Tax Holiday, Termination Date	2016 through 2019
Effective Income Tax Rate Reconciliation, Tax Holidays	(4.30%)	(5.00%)	(5.90%)
Total deferred tax assets	715.9	682.8
Total deferred tax liabilities	124.4	114.2
Cumulative undistributed earnings of foreign subsidiaries	2,081.0
Change in valuation allowance	6.1
Reasonably possible amount of increase / (decrease) in unrecognized tax benefits for the next twelve months	(1.2)
Reasonably possible amount of increase / (decrease) in offsetting tax benefits for the next twelve months	(0.8)
Interest and penalties recognized for unrecognized tax benefits	(3.1)	9.7	0.9
Accrued interest and penalties for unrecognized tax benefits	20.1	16.9
Continuing Operations [Member]
Income Tax Contingency [Line Items]
Gross Unrecognized Tax Benefits	70.3	75.1	57.5
Net Unrecognized Tax Benefits	$ 23.3	$ 30.2	$ 9.5