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
Shares issued under restricted stock plan				0.3
Net income		$ (0.7)								$ 0.3	[1]
Contributions	[1]									0.2
Distributions and adjustments to noncontrolling interests	[1]									(1.7)
Adoption of accounting standards	[2]							$ 43.5
Net income attributable to common stockholders								139.1
Dividends declared (per share - $0.465 and $0.455)	[3]							(117.8)
Compensation expense under share-based plans						$ 17.9
Issuance of common stock, net of stock received for minimum tax withholdings	[4]			2.4
Fair value of share-based awards issued in business combinations						70.8
Purchases of common stock		(1.0)		(1.0)
Ending balance at Dec. 31, 2018				255.2
Beginning balance at Sep. 30, 2018				$ 2.5		10,588.9		1,573.3	$ (695.3)	13.0	[1]
Issuance of common stock, net of stock received for minimum tax withholdings				0.1	[4]	84.8	[4]	(0.4)
Purchases of common stock						(41.8)		(2.4)
Other comprehensive income (loss), net of tax		$ (59.5)	[5]						(59.5)
Ending balance at Dec. 31, 2018		11,615.5		$ 2.6		10,720.6		1,635.3	(754.8)	11.8	[1]
Total Stockholders’ equity at Dec. 31, 2018		$ 11,603.7
Beginning balance at Sep. 30, 2019		257.8		257.8
Net income		$ (1.0)								1.0	[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								138.5
Dividends declared (per share - $0.465 and $0.455)	[3]							(121.6)
Compensation expense under share-based plans						13.5
Issuance of common stock, net of stock received for minimum tax withholdings	[4]			0.6
Purchases of common stock		0.0
Ending balance at Dec. 31, 2019		258.4		258.4
Beginning balance at Sep. 30, 2019		$ 11,684.2		$ 2.6		10,739.4		1,997.1	(1,069.2)	14.3	[1]
Issuance of common stock, net of stock received for minimum tax withholdings	[4]					17.1
Other comprehensive income (loss), net of tax		107.7	[5]						107.7
Ending balance at Dec. 31, 2019		11,840.5		$ 2.6		$ 10,770.0		$ 2,087.5	$ (1,034.9)	$ 15.3	[1]
Total Stockholders’ equity at Dec. 31, 2019		$ 11,825.2

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

[2] Fiscal 2019 is primarily for the adoption of ASU 2018-02 (as hereinafter defined) and fiscal 2018 is for 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 three months ended December 31, 2018 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.