Business Segment Information (Schedule of Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Mar. 31, 2023	Mar. 31, 2022	Sep. 30, 2022
Segment Reporting Information [Line Items]
Sales	$ 3,200.1	$ 2,945.1	$ 6,374.8	$ 5,939.3
Operating Income (Loss)	459.8	561.9	1,111.8	1,084.9
Depreciation and amortization			661.1	668.2
Equity affiliates' income	165.9	120.8	275.9	268.6
Total assets	29,435.4		29,435.4		$ 27,192.6
Segment Total
Segment Reporting Information [Line Items]
Sales	3,200.1	2,945.1	6,374.8	5,939.3
Operating Income (Loss)	645.4	561.9	1,297.4	1,084.9
Depreciation and amortization	339.6	335.9	661.1	668.2
Equity affiliates' income	165.9	120.8	275.9	268.6
Total assets	29,435.4		29,435.4		27,192.6
Americas | Segment Total
Segment Reporting Information [Line Items]
Sales	1,373.1	1,186.6	2,757.3	2,410.7
Operating Income (Loss)	324.2	275.5	667.2	542.7
Depreciation and amortization	161.7	153.7	317.7	309.0
Equity affiliates' income	28.1	20.1	44.5	54.3
Total assets	8,859.0		8,859.0		8,237.7
Asia | Segment Total
Segment Reporting Information [Line Items]
Sales	813.9	751.2	1,591.7	1,531.6
Operating Income (Loss)	233.0	203.6	468.9	424.7
Depreciation and amortization	110.0	111.8	211.9	222.6
Equity affiliates' income	7.3	6.2	14.7	12.8
Total assets	7,422.7		7,422.7		6,968.7
Europe | Segment Total
Segment Reporting Information [Line Items]
Sales	752.9	738.6	1,544.8	1,482.8
Operating Income (Loss)	173.2	116.4	319.0	215.6
Depreciation and amortization	48.3	50.3	92.6	100.1
Equity affiliates' income	29.5	23.3	47.2	37.2
Total assets	3,914.4		3,914.4		3,645.1
Middle East and India | Segment Total
Segment Reporting Information [Line Items]
Sales	44.8	28.9	86.2	52.6
Operating Income (Loss)	1.3	4.8	8.0	9.6
Depreciation and amortization	6.6	6.9	13.2	13.0
Equity affiliates' income	98.9	71.1	163.0	163.4
Total assets	4,451.8		4,451.8		2,980.7
Corporate and other | Segment Total
Segment Reporting Information [Line Items]
Sales	215.4	239.8	394.8	461.6
Operating Income (Loss)	(86.3)	(38.4)	(165.7)	(107.7)
Depreciation and amortization	13.0	13.2	25.7	23.5
Equity affiliates' income	2.1	$ 0.1	6.5	$ 0.9
Total assets	$ 4,787.5		$ 4,787.5		$ 5,360.4