Business Segment Information (Schedule of Segment Reporting Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Segment Reporting Information [Line Items]
Sales	$ 2,994.2	$ 2,375.2
Operating income (loss)	523.0	539.1
Depreciation and amortization	332.3	323.7
Equity affiliates' income	147.8	69.3
Total assets	27,125.3		$ 26,859.2
Operating Segments
Segment Reporting Information [Line Items]
Sales	2,994.2	2,375.2
Operating income (loss)	523.0	539.1
Depreciation and amortization	332.3	323.7
Equity affiliates' income	147.8	69.3
Total assets	27,125.3		26,859.2
Americas | Operating Segments
Segment Reporting Information [Line Items]
Sales	1,224.1	933.0
Operating income (loss)	267.2	225.8
Depreciation and amortization	155.3	151.8
Equity affiliates' income	34.2	22.3
Total assets	7,381.5		7,092.5
Asia | Operating Segments
Segment Reporting Information [Line Items]
Sales	780.4	717.5
Operating income (loss)	221.1	214.8
Depreciation and amortization	110.8	107.9
Equity affiliates' income	6.6	8.8
Total assets	7,619.0		7,349.4
Europe | Operating Segments
Segment Reporting Information [Line Items]
Sales	744.2	543.5
Operating income (loss)	99.2	137.5
Depreciation and amortization	49.8	49.3
Equity affiliates' income	13.9	14.9
Total assets	3,951.7		3,830.3
Middle East and India | Operating Segments
Segment Reporting Information [Line Items]
Sales	23.7	19.5
Operating income (loss)	4.8	4.0
Depreciation and amortization	6.1	6.1
Equity affiliates' income	92.3	21.2
Total assets	2,482.4		800.6
Corporate and other | Operating Segments
Segment Reporting Information [Line Items]
Sales	221.8	161.7
Operating income (loss)	(69.3)	(43.0)
Depreciation and amortization	10.3	8.6
Equity affiliates' income	0.8	$ 2.1
Total assets	$ 5,690.7		$ 7,786.4