CONDENSED CONSOLIDATED STATEMENTS OF EQUITY - USD ($) shares in Millions, $ in Millions		Total		Common Stock [Member]		Capital in Excess of Par Value [Member]		Retained Earnings [Member]	AOCI Attributable to Parent	Noncontrolling Interests [Member]
Beginning balance at Sep. 30, 2018				253.5
Beginning balance at Sep. 30, 2018				$ 2.5		$ 10,588.9		$ 1,573.3	$ (695.3)	$ 13.0	[1]
Shares issued under restricted stock plan				3.0
Net income		$ (3.4)								2.3	[1]
Contributions	[1]									0.2
Distributions and adjustments to noncontrolling interests	[1]									(1.9)
Adoption of accounting standards	[2]							43.5
Net income attributable to common stockholders								552.1
Dividends declared (per share - $0.20, $0.455, $1.13 and $1.365)	[3]							(361.0)
Compensation expense under share-based plans						52.0
Issuance of common stock, net of stock received for minimum tax withholdings	[4]			2.9
Fair value of share-based awards issued in business combinations						70.8
Purchases of common stock		(2.1)		(2.1)
Ending balance at Jun. 30, 2019				257.3
Issuance of common stock, net of stock received for minimum tax withholdings				$ 0.1	[4]	89.9	[4]	(0.4)
Purchases of common stock						(86.2)		(2.4)
Other comprehensive (loss) income, net of tax		$ (0.1)	[5]						(0.1)
Ending balance at Jun. 30, 2019		11,841.3		$ 2.6		10,715.4		1,805.1	(695.4)	13.6	[1]
Total Stockholders’ equity at Jun. 30, 2019		11,827.7
Beginning balance at Mar. 31, 2019				256.9
Beginning balance at Mar. 31, 2019				$ 2.6		10,692.5		1,671.2	(725.5)	12.8	[1]
Net income		(1.2)								0.9	[1]
Distributions and adjustments to noncontrolling interests	[1]									(0.1)
Net income attributable to common stockholders								252.6
Dividends declared (per share - $0.20, $0.455, $1.13 and $1.365)	[3]							(118.7)
Compensation expense under share-based plans						15.9
Issuance of common stock, net of stock received for minimum tax withholdings	[4]			0.4
Ending balance at Jun. 30, 2019				257.3
Issuance of common stock, net of stock received for minimum tax withholdings	[4]					7.0
Other comprehensive (loss) income, net of tax									30.1
Ending balance at Jun. 30, 2019		11,841.3		$ 2.6		10,715.4		1,805.1	(695.4)	13.6	[1]
Total Stockholders’ equity at Jun. 30, 2019		$ 11,827.7
Beginning balance at Sep. 30, 2019		257.8		257.8
Total Stockholders' equity at Sep. 30, 2019		$ 11,669.9
Beginning balance at Sep. 30, 2019		11,684.2		$ 2.6		10,739.4		1,997.1	(1,069.2)	14.3	[1]
Shares issued under restricted stock plan				0.9
Net income		(3.3)								2.5	[1]
Adoption of new standard and reclassification of stranded tax effects resulting from Tax Reform	[5]	$ (73.4)
Adoption of new standard and reclassification of stranded tax effects resulting from Tax Reform | ASU 2018-02 [Member]									(73.4)
Adoption of accounting standards	[2]							73.5
Net income attributable to common stockholders								465.1
Dividends declared (per share - $0.20, $0.455, $1.13 and $1.365)	[3]							(295.4)
Compensation expense under share-based plans						98.4
Issuance of common stock, net of stock received for minimum tax withholdings	[4]			0.8
Purchases of common stock		0.0
Ending balance at Jun. 30, 2020		259.5		259.5
Issuance of common stock, net of stock received for minimum tax withholdings	[4]					19.8
Other comprehensive (loss) income, net of tax		$ (244.8)	[5]						(244.8)
Ending balance at Jun. 30, 2020		11,729.9		$ 2.6		10,857.6		2,240.3	(1,387.4)	16.8	[1]
Total Stockholders’ equity at Jun. 30, 2020		11,713.1
Beginning balance at Mar. 31, 2020				259.2
Beginning balance at Mar. 31, 2020				$ 2.6		10,784.4		2,114.4	(1,419.0)	15.6	[1]
Shares issued under restricted stock plan				0.1
Net income		$ (1.5)								1.2	[1]
Net income attributable to common stockholders								178.5
Dividends declared (per share - $0.20, $0.455, $1.13 and $1.365)	[3]							(52.6)
Compensation expense under share-based plans						68.9
Issuance of common stock, net of stock received for minimum tax withholdings	[4]			0.2
Ending balance at Jun. 30, 2020		259.5		259.5
Issuance of common stock, net of stock received for minimum tax withholdings	[4]					4.3
Other comprehensive (loss) income, net of tax									31.6
Ending balance at Jun. 30, 2020		$ 11,729.9		$ 2.6		$ 10,857.6		$ 2,240.3	$ (1,387.4)	$ 16.8	[1]
Total Stockholders’ equity at Jun. 30, 2020		$ 11,713.1

[1] Excludes amounts related to contingently redeemable noncontrolling interests, which are separately classified outside of permanent equity on the Condensed Consolidated Balance Sheets.

[2] For fiscal 2020, the amount primarily relates to the adoption of ASU 2018-02 (as hereinafter defined). For fiscal 2019, the amount relates to the adoption of ASC 606 (as hereinafter defined).

[3] Includes cash dividends paid and dividend equivalent units on certain restricted stock awards.

[4] Included in the issuance of common stock in the nine months ended June 30, 2019 is the issuance of approximately 1.6 million shares of Common Stock (as hereinafter defined) valued at $70.1 million in connection with the KapStone Acquisition (as hereinafter defined).

[5] All amounts are net of tax and noncontrolling interests.