Business Segment and Geographic Information (Schedule of Geographic Information) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customer		$ 2,283.2	$ 2,224.0	$ 2,187.7	$ 2,224.0	$ 2,298.9	$ 2,259.0	$ 2,155.7	$ 2,216.6	$ 8,918.9	$ 8,930.2	$ 8,187.6
Long-Lived Assets	[1]	10,337.6				9,923.7				10,337.6	9,923.7	8,440.2
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customer										3,351.8	3,149.6	2,886.8
Long-Lived Assets	[1]	3,721.3				3,512.7				3,721.3	3,512.7	3,407.4
Europe, including Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customer										2,090.3	2,292.5	2,478.5
Long-Lived Assets	[1]	1,278.9				1,283.3				1,278.9	1,283.3	1,279.0
Asia, excluding China and India
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customer										953.1	904.0	849.6
Long-Lived Assets	[1]	933.8				899.8				933.8	899.8	778.5
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customer										1,730.2	1,585.7	1,143.4
Long-Lived Assets	[1]	3,302.6				3,066.6				3,302.6	3,066.6	1,737.9
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customer	[2]									793.5	998.4	829.3
Long-Lived Assets	[1],[2]	$ 1,101.0				$ 1,161.3				$ 1,101.0	$ 1,161.3	$ 1,237.4

[1] Long-lived assets include plant and equipment, net.

[2] Includes Canada, Latin America, and India.