Business Segment and Geographic Information (Schedule of Geographic Information) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers		$ 2,298.9	$ 2,259.0	$ 2,155.7	$ 2,216.6	$ 2,203.1	$ 2,121.9	$ 1,980.1	$ 1,882.5	$ 8,930.2	$ 8,187.6	$ 7,503.7
Long-Lived Assets	[1]	9,923.7				8,440.2				9,923.7	8,440.2	8,259.7
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers										3,149.6	2,886.8	2,911.7
Long-Lived Assets	[1]	3,512.7				3,407.4				3,512.7	3,407.4	3,411.4
Europe, including Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers										2,292.5	2,478.5	2,186.5
Long-Lived Assets	[1]	1,283.3				1,279.0				1,283.3	1,279.0	1,292.5
Asia, excluding China and India
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers										904.0	849.6	721.4
Long-Lived Assets	[1]	899.8				778.5				899.8	778.5	707.0
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers										1,585.7	1,143.4	1,020.4
Long-Lived Assets	[1]	3,066.6				1,737.9				3,066.6	1,737.9	1,675.8
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers	[2]									998.4	829.3	663.7
Long-Lived Assets	[1],[2]	$ 1,161.3				$ 1,237.4				$ 1,161.3	$ 1,237.4	$ 1,173.0

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

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