Consolidated Statements of Total Equity - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Treasury Stock	Non-controlling Interests
Beginning Balances at Sep. 30, 2017	$ 7,747.6	$ 3.8	$ 2,992.2	$ 4,946.0	$ (194.9)	$ 0.5
Increase (Decrease) in Stockholders' Equity
Net income	1,462.3			1,460.3		2.0
Proceeds from Noncontrolling Interests	175.2			0.0		175.2
Exercise of stock options	43.4	0.1	43.3
Stock issued under employee incentive plans	4.0		4.0
Cash paid for shares withheld for taxes	(10.3)	0.0	(10.3)	0.0	0.0	0.0
Stock based compensation expense	55.8		55.8
Cash dividends declared	(188.4)			(188.4)
Repurchases of common stock	(127.5)				(127.5)
Distributions to noncontrolling interests	(3.2)					(3.2)
Ending Balances at Sep. 30, 2018	9,158.9	3.9	3,085.0	6,217.9	(322.4)	174.5
Increase (Decrease) in Stockholders' Equity
Net income	1,618.6			1,618.5		0.1
Stockholders' Equity, Period Increase (Decrease)	27.1			27.1		0.0
Exercise of stock options	38.1		38.1
Stock issued under employee incentive plans	4.6		4.6
Cash paid for shares withheld for taxes	(19.7)	0.0	(19.7)	0.0	0.0	0.0
Stock based compensation expense	73.2		73.2
Cash dividends declared	(223.4)			(223.4)
Repurchases of common stock	(479.8)				(479.8)
Distributions to noncontrolling interests	(3.9)					(3.9)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Issuance of Equity by Subsidiary to Noncontrolling Interests	101.4		(2.1)			103.5
Ending Balances at Sep. 30, 2019	10,295.1	3.9	3,179.1	7,640.1	(802.2)	274.2
Increase (Decrease) in Stockholders' Equity
Net income	2,380.5			2,373.7		6.8
Exercise of stock options	17.8	0.0	17.8
Stock issued under employee incentive plans	5.6		5.6
Cash paid for shares withheld for taxes	(38.2)	0.0	(38.2)	0.0	0.0	0.0
Stock based compensation expense	77.8		77.8
Cash dividends declared	(256.0)			(256.0)
Repurchases of common stock	(360.4)				(360.4)
Distributions to noncontrolling interests	(0.7)					(0.7)
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Issuance of Equity by Subsidiary to Noncontrolling Interests	0.0		(1.2)			1.2
Ending Balances at Sep. 30, 2020	$ 12,121.5	$ 3.9	$ 3,240.9	$ 9,757.8	$ (1,162.6)	$ 281.5