Financial Instruments (Cash Flow and Fair Value Hedges Location and Amounts Recognized) (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Total Amounts Presented in the Consolidated Income Statement in which the Effects of Cash Flow and Fair Value Hedges are Recorded
Sales	$ 10,323.0	$ 8,856.3	$ 8,918.9
Cost of Sales	7,186.1	5,858.1	5,975.5
Other Income Expense, Net	52.8	65.4	49.3
Interest Expense	141.8	109.3	137.0
Other Nonoperating Income (Expense), Net	73.7	30.7	$ 66.7
(Gain) Loss Effects of Cash Flow Hedging:
Tax effects	13.9	(17.7)
Net (Gain) Loss Reclassified from OCI to Income	43.5	(57.7)
Cash Flow Hedges | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	(0.8)	(0.2)
Tax effects	(0.2)	0.0
Net (Gain) Loss Reclassified from OCI to Income	(0.6)	(0.2)
Cash Flow Hedges | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	(0.8)	(1.0)
Tax effects	(0.5)	(0.2)
Net (Gain) Loss Reclassified from OCI to Income	(0.3)	(0.8)
Cash Flow Hedges | Interest Expense
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	5.6	4.2
Tax effects	2.1	1.4
Net (Gain) Loss Reclassified from OCI to Income	3.5	2.8
Cash Flow Hedges | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	53.4	(78.4)
Tax effects	12.5	(18.9)
Net (Gain) Loss Reclassified from OCI to Income	40.9	(59.5)
Cash Flow Hedges | Forward exchange contracts | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	(0.8)	(0.2)
Cash Flow Hedges | Forward exchange contracts | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	(0.8)	(1.0)
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
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	5.2	(117.9)
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
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
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
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	9.1	17.0
Cash Flow Hedges | Other | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	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
Cash Flow Hedges | Other | Interest Expense
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	5.6	4.2
Cash Flow Hedges | Other | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	39.1	22.5
Fair Value Hedges | Sales
(Gain) Loss Effects of Fair Value Hedging
Total (Gain) Loss Recognized in Income	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
Fair Value Hedges | Interest Expense
(Gain) Loss Effects of Fair Value Hedging
Total (Gain) Loss Recognized in Income	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
Fair Value Hedges | Other | Sales
(Gain) Loss Effects of Fair Value Hedging
Hedges items	0.0	0.0
Derivatives designated as hedging instruments	0.0	0.0
Fair Value Hedges | Other | Cost of Sales
(Gain) Loss Effects of Fair Value Hedging
Hedges items	0.0	0.0
Derivatives designated as hedging instruments	0.0	0.0
Fair Value Hedges | Other | Interest Expense
(Gain) Loss Effects of Fair Value Hedging
Hedges items	(5.2)	0.5
Derivatives designated as hedging instruments	5.2	(0.5)
Fair Value Hedges | Other | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Fair Value Hedging
Hedges items	0.0	0.0
Derivatives designated as hedging instruments	$ 0.0	$ 0.0