Basis of Presentation and Accounting Policies (Details Textual) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2016
Accounting Policies [Abstract]
Allowance for doubtful accounts	$ 24.4		$ 24.4		$ 24.5
Allowance for certain customer returns, rebates and incentives	$ 10.8		$ 10.8		$ 7.9
Antidilutive share-based compensation awards	1.0	2.9	1.0	2.9
Capital expenditures in accounts payable or other current liabilities at period end			$ 17.6	$ 13.8
Outstanding purchase of common stock recorded in accounts payable			7.0	$ 3.4
Reduction in income tax provision from early adoption of new share-based compensation standard	$ 16.8		$ 20.2