Business Segment and Geographic Information (Schedule of Geographic Information) (Details) - USD ($) $ in Millions		3 Months Ended								12 Months Ended
		Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers		$ 2,203.1	$ 2,121.9	$ 1,980.1	$ 1,882.5	$ 1,945.5	$ 1,914.5	$ 1,777.4	$ 1,866.3	$ 8,187.6	$ 7,503.7	$ 7,824.3
Long-Lived Assets	[1]	8,440.2				8,259.7				8,440.2	8,259.7	8,237.3
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers										2,886.8	2,911.7	3,369.8
Long-Lived Assets	[1]	3,407.4				3,411.4				3,407.4	3,411.4	3,502.9
Europe, including Middle East
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers										2,478.5	2,186.5	1,989.2
Long-Lived Assets	[1]	1,279.0				1,292.5				1,279.0	1,292.5	1,379.8
Asia, excluding China and India
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers										849.6	721.4	736.8
Long-Lived Assets	[1]	778.5				707.0				778.5	707.0	627.1
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers										1,143.4	1,020.4	957.8
Long-Lived Assets	[1]	1,737.9				1,675.8				1,737.9	1,675.8	1,682.8
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales to External Customers	[2]									829.3	663.7	770.7
Long-Lived Assets	[1],[2]	$ 1,237.4				$ 1,173.0				$ 1,237.4	$ 1,173.0	$ 1,044.7

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

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