Financial Instruments and Risk Management (Schedule of Gains and Losses on Derivative Instruments) (Details) - FX contract - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2021	Dec. 31, 2020
Designated as hedge | Cash flow hedge
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in OCI	[1]	$ 1.8	$ (4.0)
Other expense (income), net | Designated as hedge | Cash flow hedge
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from AOCI into income (effective portion)	[1],[2]	1.3	(1.4)
Other expense (income), net | Not designated as hedge
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income	[2]	$ (1.1)	$ 1.1

[1] Each of these derivative instruments had a high correlation to the underlying exposure being hedged for the periods indicated and have been deemed highly effective by the Company in offsetting associated risk.

[2] Gain (loss) was recorded in Other income, net.