Financial Instruments (Cash Flow and Fair Value Hedges Location and Amounts Recognized) (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Total presented in consolidated income statements that includes effects of hedging below
Sales	$ 3,102.5	$ 2,931.5
Cost of sales	2,107.5	2,016.5
Interest expense	54.5	42.6
Other non-operating income (expense), net	(1.4)	38.9
(Gain) Loss Effects of Cash Flow Hedging:
Tax effects	(4.8)	(27.8)
Net (Gain) Loss Reclassified from OCI to Income	16.6	91.9
Cash flow hedges | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	(1.1)	0.2
Tax effects	0.2	0.0
Net (Gain) Loss Reclassified from OCI to Income	(0.9)	0.2
Cash flow hedges | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	0.2	0.9
Tax effects	0.0	(0.1)
Net (Gain) Loss Reclassified from OCI to Income	0.2	0.8
Cash flow hedges | Interest Expense
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	(0.4)	0.5
Tax effects	0.1	(0.2)
Net (Gain) Loss Reclassified from OCI to Income	(0.3)	0.3
Cash flow hedges | Other non‑operating income (expense), net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	22.7	118.1
Tax effects	(5.1)	(27.5)
Net (Gain) Loss Reclassified from OCI to Income	17.6	90.6
Cash flow hedges | Forward exchange contracts | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	(1.1)	0.2
Cash flow hedges | Forward exchange contracts | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	0.2	0.9
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	7.2	129.3
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	5.5	6.1
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	(0.4)	0.5
Cash flow hedges | Other | Other non‑operating income (expense), net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	10.0	(17.3)
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:
Hedged 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:
Hedged 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:
Hedged items	3.2	(10.9)
Derivatives designated as hedging instruments	(3.2)	10.9
Fair Value Hedges | Other | Other non‑operating income (expense), net
(Gain) Loss Effects of Fair Value Hedging:
Hedged items	0.0	0.0
Derivatives designated as hedging instruments	$ 0.0	$ 0.0