Business Segment Information (Narratives) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Sales	$ 2,470.2	$ 2,634.6	$ 7,445.5	$ 7,762.0
Industrial Gases Global [Member]
Segment Reporting Information [Line Items]
Sales	71.3	70.8	197.4	206.4
Industrial Gases Global [Member] \| Intersegment Elimination [Member]
Segment Reporting Information [Line Items]
Sales	$ 66.3	$ 51.7	$ 180.0	$ 141.4

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.1)

-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

-Article 5

Name:	us-gaap_SalesRevenueNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration