Income Taxes (Details Textuals) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Expiration date of primary benefit of non-U.S. government sponsored tax incentive programs	2019
Tax benefit attributable to non-U.S. government sponsored tax incentive programs	$ 33.9	$ 36.5	$ 42.9
Tax benefit per diluted share attributable to non-U.S. government sponsored tax incentive programs	$ 0.26	$ 0.27	$ 0.31
Cumulative undistributed earnings of foreign subsidiaries	$ 3,274.0
Gross unrecognized tax benefits	32.4	$ 43.9	$ 38.9	$ 40.8
Accrued interest and penalties for unrecognized tax benefits	5.2	5.1
Benefits (expense) recognized for interest and penalties related to unrecognized tax benefits	$ (0.1)	$ 2.4	$ 4.0
Expected change in gross unrecognized tax benefits in next 12 months	We do not expect the amount of gross unrecognized tax benefits to change significantly in the next 12 months
Earliest open year for income tax examinations, U.S. federal	2014
Earliest open year for income tax examinations, state, local and non-U.S.	2003