Income Taxes (Details Textuals) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Expiration date of primary benefit of non-U.S. government sponsored tax incentive programs	2022
Tax benefit attributable to non-U.S. government sponsored tax incentive programs	$ 43.4	$ 33.9	$ 36.5
Tax benefit per diluted share attributable to non-U.S. government sponsored tax incentive programs	$ 0.33	$ 0.26	$ 0.27
Cumulative undistributed earnings of foreign subsidiaries	$ 3,526.0
Gross unrecognized tax benefits	31.1	$ 32.4	$ 43.9	$ 38.9
Accrued interest and penalties for unrecognized tax benefits	4.0	5.2
Benefits (expense) recognized for interest and penalties related to unrecognized tax benefits	1.2	$ (0.1)	$ 2.4
Reasonably possible amount of reduction of gross unrecognized tax benefit in the next twelve months	9.5
Reasonably possible amount of net reduction to income tax provision in the next twelve months if unrecognized tax benefits were recognized, including the recognition of interest and penalties and offsetting tax assets	$ 4.4
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