Financial Instruments (Cash Flow and Fair Value Hedges Location and Amounts Recognized) (Details) - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Total Amounts Presented in the Consolidated Income Statement in which the Effects of Cash Flow and Fair Value Hedges are Recorded
Sales		$ 2,254.7	$ 2,224.0
Cost of sales		1,486.6	1,544.0
Other income (expense), net		12.3	8.6
Interest expense		18.7	37.3
Other non-operating income (expense), net		9.1	18.5
(Gain) Loss Effects of Cash Flow Hedging:
Tax effects		(0.8)
Net (Gain) Loss Reclassified from OCI to Income		(3.6)
Tax effects			(0.8)
Net (Gain) Loss Reclassified from OCI to Income			(3.1)
Cash Flow Hedges | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income		0.1
Tax effects		0.0
Net (Gain) Loss Reclassified from OCI to Income		0.1
Amount reclassified from OCI into income			0.4
Tax effects			0.1
Net (Gain) Loss Reclassified from OCI to Income			0.3
Cash Flow Hedges | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income		(0.2)
Tax effects		(0.1)
Net (Gain) Loss Reclassified from OCI to Income		(0.1)
Amount reclassified from OCI into income			0.2
Tax effects			0.0
Net (Gain) Loss Reclassified from OCI to Income			0.2
Cash Flow Hedges | Other Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income		0.0
Tax effects		0.0
Net (Gain) Loss Reclassified from OCI to Income		0.0
Amount reclassified from OCI into income			(9.7)
Tax effects			(2.3)
Net (Gain) Loss Reclassified from OCI to Income			(7.4)
Cash Flow Hedges | Interest Expense
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income		1.0
Tax effects		0.3
Net (Gain) Loss Reclassified from OCI to Income		0.7
Amount reclassified from OCI into income			5.2
Tax effects			1.4
Net (Gain) Loss Reclassified from OCI to Income			3.8
Cash Flow Hedges | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income		(5.3)
Tax effects		(1.0)
Net (Gain) Loss Reclassified from OCI to Income		(4.3)
Amount reclassified from OCI into income			0.0
Tax effects			0.0
Net (Gain) Loss Reclassified from OCI to Income			0.0
Cash Flow Hedges | Forward Exchange Contracts | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[1]	0.1
Amount reclassified from OCI into income	[1]		0.4
Cash Flow Hedges | Forward Exchange Contracts | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[1]	(0.2)
Amount reclassified from OCI into income	[1]		0.2
Cash Flow Hedges | Forward Exchange Contracts | Other Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[1]	0.0
Amount reclassified from OCI into income	[1]		(11.9)
Cash Flow Hedges | Forward Exchange Contracts | Interest Expense
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[1]	0.0
Amount reclassified from OCI into income	[1]		4.2
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	[1]	(23.4)
Amount reclassified from OCI into income	[1]		0.0
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(A)	[1]	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(A)	[1]	0.0
Cash Flow Hedges | Forward Exchange Contracts, Excluded Components | Other Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount excluded from effectiveness testing recognized in earnings based on amortization approach(A)	[1]	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(A)	[1]	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(A)	[1]	4.5
Cash Flow Hedges | Other | Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[2]	0.0
Amount reclassified from OCI into income	[2]		0.0
Cash Flow Hedges | Other | Cost of Sales
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[2]	0.0
Amount reclassified from OCI into income	[2]		0.0
Cash Flow Hedges | Other | Other Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[2]	0.0
Amount reclassified from OCI into income	[2]		2.2
Cash Flow Hedges | Other | Interest Expense
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[2]	1.0
Amount reclassified from OCI into income	[2]		1.0
Cash Flow Hedges | Other | Other Non-Operating Income (Expense), Net
(Gain) Loss Effects of Cash Flow Hedging:
Amount reclassified from OCI into income	[2]	13.6
Amount reclassified from OCI into income	[2]		0.0
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 | Other Income (Expense), Net
(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 | Other 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
Fair Value Hedges | Other | Interest Expense
(Gain) Loss Effects of Fair Value Hedging:
Hedged items		(0.9)	2.6
Derivatives designated as hedging instruments		0.9	(2.6)
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

[1] Net amount excluded from effectiveness testing recognized in interest expense for FY19, see Note 2, New Accounting Guidance, for additional details.

[2] Other primarily includes interest rate and cross currency interest rate swaps for which excluded components are recognized in “Payables and accrued liabilities” and “Other receivables and current assets” as a component of accrued interest payable and accrued interest receivable, respectively. These excluded components are recorded in “Other Non-operating income (expense), net” over the life of the cross currency interest rate swap.