Condensed Consolidated Statements of Changes in Equity (unaudited) (USD $) In Millions, unless otherwise specified	Total	Parent	Common Stock, Without Par Value	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Treasury Stock	Noncontrolling Interests
Balance, beginning of period at Sep. 30, 2013			$ 1,208.1	$ 1,308.3	$ 8.4	$ (32.3)	$ 1,055.4
Increase (Decrease) in Stockholders' Equity
Common Stock issued in connection with employee and director plans (including (losses) gains on treasury stock transactions), net of tax withheld			(5.2)
Excess tax benefits realized on equity-based compensation			5.9
Equity-based compensation expense			6.8
Net income	605.3			336.4			268.9
Cash dividends on Common Stock				(64.8)
Net gains on derivative instruments, net of tax	46.8				13.5
Reclassification of net losses (gains) on derivative instruments, net of tax	(45.2)				(9.9)
Benefit plans, net of tax	0.6				0.6
Foreign currency, net of tax	11.7				11.7
Common stock issued in connection with employee and director plans, net of tax withheld						29.9
Repurchases of Common Stock						(4.5)
Reacquired common stock - employee and director plans						(17.7)
Net gains on derivative instruments							33.3
Reclassification of net gains on derivative instruments							(35.3)
Dividends and distributions							(116.1)
Other							0.7
Balance, end of period at Mar. 31, 2014	4,002.1	2,795.2	1,215.6	1,579.9	24.3	(24.6)	1,206.9
Balance, beginning of period at Sep. 30, 2014	3,663.2		1,215.6	1,509.4	(21.2)	(44.7)	1,004.1
Increase (Decrease) in Stockholders' Equity
Common Stock issued in connection with employee and director plans (including (losses) gains on treasury stock transactions), net of tax withheld			(15.1)
Excess tax benefits realized on equity-based compensation			5.0
Equity-based compensation expense			9.5
Net income	482.4			280.6			201.8
Cash dividends on Common Stock				(75.0)
Net gains on derivative instruments, net of tax	27.9				27.9
Reclassification of net losses (gains) on derivative instruments, net of tax	0.2				1.9
Benefit plans, net of tax	1.0				1.0
Foreign currency, net of tax	(95.0)				(95.0)
Common stock issued in connection with employee and director plans, net of tax withheld						24.7
Repurchases of Common Stock						(17.3)
Reacquired common stock - employee and director plans						(4.3)
Net gains on derivative instruments							0
Reclassification of net gains on derivative instruments							(1.7)
Dividends and distributions							(122.2)
Other							(1.3)
Balance, end of period at Mar. 31, 2015	$ 3,883.7	$ 2,803.0	$ 1,215.0	$ 1,715.0	$ (85.4)	$ (41.6)	$ 1,080.7