Business Segment and Geographic Information (Schedule of Geographic Information) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales	$ 2,320.1	$ 2,065.2	$ 2,216.3	$ 2,254.7	$ 2,283.2	$ 2,224.0	$ 2,187.7	$ 2,224.0	$ 8,856.3	$ 8,918.9	$ 8,930.2
Long-Lived Assets	11,964.7				10,337.6				11,964.7	10,337.6	9,923.7
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									3,359.6	3,351.8	3,149.6
Long-Lived Assets	4,633.9				3,721.3				4,633.9	3,721.3	3,512.7
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									1,719.7	1,730.2	1,585.7
Long-Lived Assets	3,719.4				3,302.6				3,719.4	3,302.6	3,066.6
Other foreign operations
Revenues from External Customers and Long-Lived Assets [Line Items]
Sales									3,777.0	3,836.9	4,194.9
Long-Lived Assets	$ 3,611.4				$ 3,313.7				$ 3,611.4	$ 3,313.7	$ 3,344.4