Financial Instruments (Cash Flow and Fair Value Hedges Location and Amounts Recognized) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Total presented in consolidated income statements that includes effects of hedging below
Sales	$ 2,930.2	$ 3,200.1	$ 5,927.6	$ 6,374.8
Cost of sales	1,991.5	2,282.8	4,058.7	4,555.1
Interest expense	59.9	40.9	113.4	82.1
Other non-operating income (expense), net	(9.2)	(13.9)	(24.0)	(14.5)
(Gain) Loss Effects of Cash Flow Hedging:
Tax effects	(10.6)	(1.9)	2.2	19.8
Net (Gain) Loss Reclassified from OCI to Income	34.8	5.8	(7.4)	(62.9)
Cash flow hedges | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	(0.4)	0.1	(0.1)	0.1
Tax effects	0.1	0.0	0.0	0.0
Net (Gain) Loss Reclassified from OCI to Income	(0.3)	0.1	(0.1)	0.1
Cash flow hedges | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	0.5	2.4	1.8	3.6
Tax effects	(0.1)	(0.6)	(0.4)	(0.8)
Net (Gain) Loss Reclassified from OCI to Income	0.4	1.8	1.4	2.8
Cash flow hedges | Interest Expense
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	1.1	1.3	2.4	2.8
Tax effects	(0.4)	(0.6)	(0.9)	(1.1)
Net (Gain) Loss Reclassified from OCI to Income	0.7	0.7	1.5	1.7
Cash flow hedges | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	44.2	3.9	(13.7)	(89.2)
Tax effects	(10.2)	(0.7)	3.5	21.7
Net (Gain) Loss Reclassified from OCI to Income	34.0	3.2	(10.2)	(67.5)
Cash flow hedges | Forward exchange contracts | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	(0.4)	0.1	(0.1)	0.1
Cash flow hedges | Forward exchange contracts | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	0.5	2.4	1.8	3.6
Cash flow hedges | Forward exchange contracts | Interest Expense
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	0.0	0.0	0.0	0.0
Cash flow hedges | Forward exchange contracts | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	48.3	(6.1)	(26.6)	(123.9)
Cash flow hedges | Forward exchange contracts, excluded components | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount excluded from effectiveness testing recognized in earnings based on amortization approach	0.0	0.0	0.0	0.0
Cash flow hedges | Forward exchange contracts, excluded components | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount excluded from effectiveness testing recognized in earnings based on amortization approach	0.0	0.0	0.0	0.0
Cash flow hedges | Forward exchange contracts, excluded components | Interest Expense
(Gain) Loss Effects of Cash Flow Hedging:
Amount excluded from effectiveness testing recognized in earnings based on amortization approach	0.0	0.0	0.0	0.0
Cash flow hedges | Forward exchange contracts, excluded components | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount excluded from effectiveness testing recognized in earnings based on amortization approach	5.3	3.3	11.0	5.3
Cash flow hedges | Other | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	0.0	0.0	0.0	0.0
Cash flow hedges | Other | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	0.0	0.0	0.0	0.0
Cash flow hedges | Other | Interest Expense
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	1.1	1.3	2.4	2.8
Cash flow hedges | Other | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	(9.4)	6.7	1.9	29.4
Fair Value Hedges | Sales
(Gain) Loss Effects of Fair Value Hedging:
Total (Gain) Loss Recognized in Income	0.0	0.0	0.0	0.0
Fair Value Hedges | Cost of Sales
(Gain) Loss Effects of Fair Value Hedging:
Total (Gain) Loss Recognized in Income	0.0	0.0	0.0	0.0
Fair Value Hedges | Interest Expense
(Gain) Loss Effects of Fair Value Hedging:
Total (Gain) Loss Recognized in Income	0.0	0.0	0.0	0.0
Fair Value Hedges | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Fair Value Hedging:
Total (Gain) Loss Recognized in Income	0.0	0.0	0.0	0.0
Fair Value Hedges | Other | Sales
(Gain) Loss Effects of Fair Value Hedging:
Hedged items	0.0	0.0	0.0	0.0
Derivatives designated as hedging instruments	0.0	0.0	0.0	0.0
Fair Value Hedges | Other | Cost of Sales
(Gain) Loss Effects of Fair Value Hedging:
Hedged items	0.0	0.0	0.0	0.0
Derivatives designated as hedging instruments	0.0	0.0	0.0	0.0
Fair Value Hedges | Other | Interest Expense
(Gain) Loss Effects of Fair Value Hedging:
Hedged items	(8.2)	12.8	17.9	17.2
Derivatives designated as hedging instruments	8.2	(12.8)	(17.9)	(17.2)
Fair Value Hedges | Other | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Fair Value Hedging:
Hedged items	0.0	0.0	0.0	0.0
Derivatives designated as hedging instruments	$ 0.0	$ 0.0	$ 0.0	$ 0.0