Equity (Changes in Equity) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Schedule of Capitalization [Line Items]
Balance, beginning of period	$ 6,517.4		$ 6,407.4		$ 6,623.3		$ 5,938.7
Net Income	295.8		492.5		878.4		1,051.0
Other comprehensive income (loss)	(57.6)		(127.1)		(87.6)		2.3
Dividends on common stock	(148.8)		(135.5)		(429.6)		(393.0)
Dividends to noncontrolling interests	(7.2)		(3.1)		(13.6)		(16.1)
Share-based compensation expense	10.6		8.8		33.0		35.8
Purchase of treasury shares	0		0		(461.6)		(53.1)
Issuance of treasury shares for stock option and award plans	69.0		15.1		118.5		76.9
Tax benefit of stock option and award plans	14.5		2.6		34.2		28.0
Purchase of noncontrolling interests	(1.3)		0		(1.6)		(6.3)
Other equity transactions	(1.0)		(13.3)		(2.0)		(16.8)
Balance, end of period	6,691.4		6,647.4		6,691.4		6,647.4
Air Products [Member]
Schedule of Capitalization [Line Items]
Balance, beginning of period	6,365.5		6,262.7		6,477.2		5,795.8
Net Income	288.4		484.5		857.1		1,028.6
Other comprehensive income (loss)	(56.2)		(125.7)		(84.5)		(0.4)
Dividends on common stock	(148.8)		(135.5)		(429.6)		(393.0)
Dividends to noncontrolling interests	0		0		0		0
Share-based compensation expense	10.6		8.8		33.0		35.8
Purchase of treasury shares	0		0		(461.6)		(53.1)
Issuance of treasury shares for stock option and award plans	69.0		15.1		118.5		76.9
Tax benefit of stock option and award plans	14.5		2.6		34.2		28.0
Purchase of noncontrolling interests	(1.3)		0		(1.6)		(4.4)
Other equity transactions	(0.9)		1.1		(1.9)		(0.6)
Balance, end of period	6,540.8		6,513.6		6,540.8		6,513.6
Noncontrolling Interests [Member]
Schedule of Capitalization [Line Items]
Balance, beginning of period	151.9		144.7		146.1		142.9
Net Income	7.4	[1]	8.0	[1]	21.3	[1]	22.4	[1]
Other comprehensive income (loss)	(1.4)		(1.4)		(3.1)		2.7
Dividends on common stock	0		0		0		0
Dividends to noncontrolling interests	(7.2)		(3.1)		(13.6)		(16.1)
Share-based compensation expense	0		0		0		0
Purchase of treasury shares	0		0		0		0
Issuance of treasury shares for stock option and award plans	0		0		0		0
Tax benefit of stock option and award plans	0		0		0		0
Purchase of noncontrolling interests	0		0		0		(1.9)
Other equity transactions	(0.1)		(14.4)		(0.1)		(16.2)
Balance, end of period	$ 150.6		$ 133.8		$ 150.6		$ 133.8

[1] Net income attributable to noncontrolling interests for the three and nine months ended 30 June 2013 excludes net income of $2.6 and $6.8, respectively, related to redeemable noncontrolling interests, which are not part of total equity. There were no redeemable noncontrolling interests recorded at 30 June 2012. Refer to Note 14, Noncontrolling Interests, for additional information.