Income Taxes (Components of the Income Taxes Provision) (Details) - USD ($) $ in Millions	3 Months Ended													12 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	[1]	Mar. 31, 2019	Dec. 31, 2018	[1]	Sep. 30, 2018	[1],[2]	Jun. 30, 2018	Mar. 31, 2018	[2]	Dec. 31, 2017	[1]	Sep. 30, 2019		Sep. 30, 2018		Sep. 30, 2017
Current Tax Provision
Federal														$ 163.7		$ 305.1		$ 62.8
State														23.3		17.7		7.0
Foreign														235.5		256.9		229.1
Total Current Tax Provision														422.5		579.7		298.9
Deferred Tax Provision
Federal														9.7		(121.7)		1.4
State														2.4		12.5		6.0
Foreign														45.5		53.8		(45.4)
Total Deferred Tax Provision														57.6		(55.4)		(38.0)
Total Income tax provision	$ 131.2	$ 109.3		$ 107.5	$ 132.1		$ 69.2		$ 107.1	$ 56.2		$ 291.8		$ 480.1	[1]	$ 524.3	[1],[2]	$ 260.9

[1] Our income tax provision for fiscal years 2019 and 2018 reflects impacts from the U.S. Tax Cuts and Jobs Act (the "Tax Act"). Refer to Note 23, Income Taxes, for additional information. Fiscal year 2019 includes a discrete net income tax expense of $43.8, primarily recorded in the first quarter to finalize our estimates of the impacts of the Tax Act. Fiscal year 2018 includes a discrete net income tax expense of $180.6, primarily recorded in the first quarter for our initial estimates of the impacts of the Tax Act.

[2] Includes an income tax benefit of $35.7, net of reserves for uncertain tax positions, resulting from the restructuring of several foreign subsidiaries, primarily during the second quarter.