Equity (Changes in Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Dec. 31, 2013		Dec. 31, 2012
Schedule of Capitalization [Line Items]
Balance, beginning of period	$ 7,198.9		$ 6,623.3
Net Income	297.8		285.1
Other comprehensive income (loss)	52.6		104.5
Dividends on common stock	(150.3)		(132.9)
Dividends to noncontrolling interests	(4.6)		(2.1)
Share-based compensation expense	11.8		10.1
Purchase of treasury shares	0		(461.6)
Issuance of treasury shares for stock option and award plans	13.2		14.8
Tax benefit of stock option and award plans	4.8		10.2
Purchase of noncontrolling interests	(0.5)		0
Other equity transactions	(1.0)		(0.2)
Balance, end of period	7,422.7		6,451.2
Air Products [Member]
Schedule of Capitalization [Line Items]
Balance, beginning of period	7,042.1		6,477.2
Net Income	290.2		278.3
Other comprehensive income (loss)	53.7		103.4
Dividends on common stock	(150.3)		(132.9)
Dividends to noncontrolling interests	0		0
Share-based compensation expense	11.8		10.1
Purchase of treasury shares	0		(461.6)
Issuance of treasury shares for stock option and award plans	13.2		14.8
Tax benefit of stock option and award plans	4.8		10.2
Purchase of noncontrolling interests	(0.5)		0
Other equity transactions	(1.0)		(0.2)
Balance, end of period	7,264.0		6,299.3
Noncontrolling Interests [Member]
Schedule of Capitalization [Line Items]
Balance, beginning of period	156.8		146.1
Net Income	7.6	[1]	6.8	[1]
Other comprehensive income (loss)	(1.1)		1.1
Dividends on common stock	0		0
Dividends to noncontrolling interests	(4.6)		(2.1)
Share-based compensation expense	0		0
Purchase of treasury shares	0		0
Issuance of treasury shares for stock option and award plans	0		0
Tax benefit of stock option and award plans	0		0
Purchase of noncontrolling interests	0		0
Other equity transactions	0		0
Balance, end of period	$ 158.7		$ 151.9

[1] Net income attributable to noncontrolling interests for the three months ended 31 December 2013 and 2012 excludes net income of $1.3 and $2.1, respectively, related to redeemable noncontrolling interests, which are not part of total equity. Refer to Note 14, Noncontrolling Interests, for additional information.