Financial Instruments and Risk Management (Schedule of Gains and Losses on Derivative Instruments) (Details) - FX contract - USD ($) $ in Millions		3 Months Ended
		Dec. 31, 2019	Dec. 31, 2018
Designated as hedge | Cash flow hedge
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in OCI	[1]	$ (0.9)	$ (0.2)
Other (income) expense, net | Designated as hedge | Cash flow hedge
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) reclassified from AOCI into income (effective portion)	[1],[2]	0.9	1.8
Other (income) expense, net | Not designated as hedge
Derivative Instruments, Gain (Loss) [Line Items]
Gain (loss) recognized in income	[2]	$ (0.3)	$ 1.3

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

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