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		$ (2.2)								1.4	[1]
Contributions	[1]									0.2
Distributions and adjustments to noncontrolling interests	[1]									(1.8)
Adoption of accounting standards	[2]							43.5
Net income attributable to common stockholders								299.5
Dividends declared (per share - $0.465, $0.455, $0.93 and $0.91)	[3]							(242.3)
Compensation expense under share-based plans						36.1
Issuance of common stock, net of stock received for minimum tax withholdings	[4]			2.5
Fair value of share-based awards issued in business combinations						70.8
Purchases of common stock		(2.1)		(2.1)
Ending balance at Mar. 31, 2019				256.9
Issuance of common stock, net of stock received for minimum tax withholdings				$ 0.1	[4]	82.9	[4]	(0.4)
Purchases of common stock						(86.2)		(2.4)
Other comprehensive (loss) income, net of tax		$ (30.2)	[5]						(30.2)
Ending balance at Mar. 31, 2019		11,653.6		$ 2.6		10,692.5		1,671.2	(725.5)	12.8	[1]
Total Stockholders’ equity at Mar. 31, 2019		11,640.8
Beginning balance at Dec. 31, 2018				255.2
Beginning balance at Dec. 31, 2018				$ 2.6		10,720.6		1,635.3	(754.8)	11.8	[1]
Shares issued under restricted stock plan				2.7
Net income		(1.5)								1.1	[1]
Distributions and adjustments to noncontrolling interests	[1]									(0.1)
Net income attributable to common stockholders								160.4
Dividends declared (per share - $0.465, $0.455, $0.93 and $0.91)	[3]							(124.5)
Compensation expense under share-based plans						18.2
Issuance of common stock, net of stock received for minimum tax withholdings	[4]			0.1
Purchases of common stock				(1.1)
Ending balance at Mar. 31, 2019				256.9
Issuance of common stock, net of stock received for minimum tax withholdings	[4]					(1.9)
Purchases of common stock						(44.4)
Other comprehensive (loss) income, net of tax									29.3
Ending balance at Mar. 31, 2019		11,653.6		$ 2.6		10,692.5		1,671.2	(725.5)	12.8	[1]
Total Stockholders’ equity at Mar. 31, 2019		$ 11,640.8
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				0.8
Net income		(1.8)								1.3	[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								286.6
Dividends declared (per share - $0.465, $0.455, $0.93 and $0.91)	[3]							(242.8)
Compensation expense under share-based plans						29.5
Issuance of common stock, net of stock received for minimum tax withholdings	[4]			0.6
Purchases of common stock		0.0
Ending balance at Mar. 31, 2020		259.2		259.2
Issuance of common stock, net of stock received for minimum tax withholdings	[4]					15.5
Other comprehensive (loss) income, net of tax		$ (276.4)	[5]						(276.4)
Ending balance at Mar. 31, 2020		11,498.0		$ 2.6		10,784.4		2,114.4	(1,419.0)	15.6	[1]
Total Stockholders’ equity at Mar. 31, 2020		11,482.4
Beginning balance at Dec. 31, 2019				258.4
Beginning balance at Dec. 31, 2019				$ 2.6		10,770.0		2,087.5	(1,034.9)	15.3	[1]
Shares issued under restricted stock plan				0.8
Net income		$ (0.8)								0.3	[1]
Net income attributable to common stockholders								148.1
Dividends declared (per share - $0.465, $0.455, $0.93 and $0.91)	[3]							(121.2)
Compensation expense under share-based plans						16.0
Ending balance at Mar. 31, 2020		259.2		259.2
Issuance of common stock, net of stock received for minimum tax withholdings	[4]					(1.6)
Other comprehensive (loss) income, net of tax									(384.1)
Ending balance at Mar. 31, 2020		$ 11,498.0		$ 2.6		$ 10,784.4		$ 2,114.4	$ (1,419.0)	$ 15.6	[1]
Total Stockholders’ equity at Mar. 31, 2020		$ 11,482.4

[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 six months ended March 31, 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.