Financial Instruments and Risk Management (Schedule of Gains and Losses on Derivative Instruments) (Details) - FX contract - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Designated as hedge | Cash flow hedge
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in OCI	[1]	$ (0.2)	$ (1.6)	$ 1.5	$ 0.4
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]	(0.5)	1.0	(3.7)	2.6
Other expense (income), net | Not designated as hedge
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income	[2]	$ 1.2	$ (0.3)	$ (0.7)	$ 0.2

[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.