Intangible Assets (Narratives) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets		$ 36.0	$ 42.1	$ 42.3
Acquired Indefinite-Lived Intangible Assets [Line Items]
Intangible asset impairment charge	$ 4.9
Industrial Gases Americas [Member]
Acquired Indefinite-Lived Intangible Assets [Line Items]
Intangible asset impairment charge	$ 4.9