Business Segment Information (Schedule of Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2021
Segment Reporting Information [Line Items]
Sales	$ 3,189.3	$ 2,604.7	$ 9,128.6	$ 7,481.9
Operating income (loss)	627.4	577.1	1,712.3	1,664.7
Depreciation and amortization			1,005.4	988.7
Equity affiliates' income	116.1	63.2	384.7	202.3
Total assets	27,489.0		27,489.0		$ 26,859.2
Operating Segments
Segment Reporting Information [Line Items]
Sales	3,189.3	2,604.7	9,128.6	7,481.9
Operating income (loss)	627.4	577.1	1,712.3	1,651.1
Depreciation and amortization	337.2	335.7	1,005.4	988.7
Equity affiliates' income	116.1	63.2	384.7	202.3
Total assets	27,489.0		27,489.0		26,859.2
Americas | Operating Segments
Segment Reporting Information [Line Items]
Sales	1,416.3	1,063.3	3,827.0	3,052.4
Operating income (loss)	298.9	286.0	841.6	775.2
Depreciation and amortization	160.5	154.2	469.5	459.3
Equity affiliates' income	21.4	24.6	75.7	79.2
Total assets	8,055.2		8,055.2		7,092.5
Asia | Operating Segments
Segment Reporting Information [Line Items]
Sales	751.4	751.8	2,283.0	2,166.8
Operating income (loss)	210.6	219.1	635.3	632.4
Depreciation and amortization	107.6	113.8	330.2	331.4
Equity affiliates' income	5.7	8.3	18.5	24.2
Total assets	7,297.5		7,297.5		7,349.4
Europe | Operating Segments
Segment Reporting Information [Line Items]
Sales	739.6	599.4	2,222.4	1,701.3
Operating income (loss)	137.4	134.0	353.0	404.4
Depreciation and amortization	48.9	52.5	149.0	152.8
Equity affiliates' income	20.6	11.6	57.8	39.1
Total assets	3,764.2		3,764.2		3,830.3
Middle East and India | Operating Segments
Segment Reporting Information [Line Items]
Sales	35.4	23.9	88.0	69.6
Operating income (loss)	6.9	6.1	16.5	16.8
Depreciation and amortization	6.8	6.2	19.8	18.9
Equity affiliates' income	67.2	17.1	230.6	54.4
Total assets	2,815.3		2,815.3		800.6
Corporate and other | Operating Segments
Segment Reporting Information [Line Items]
Sales	246.6	166.3	708.2	491.8
Operating income (loss)	(26.4)	(68.1)	(134.1)	(177.7)
Depreciation and amortization	13.4	9.0	36.9	26.3
Equity affiliates' income	1.2	$ 1.6	2.1	$ 5.4
Total assets	$ 5,556.8		$ 5,556.8		$ 7,786.4