Financial Instruments and Risk Management (Schedule of Fair Values of Derivative Instruments) (Details) - FX contract - USD ($) $ in Millions		Dec. 31, 2021	Sep. 30, 2021
Not designated as hedge
Derivatives, Fair Value [Line Items]
Estimated fair value of derivatives	[1]	$ 0.7	$ 0.5
Cash flow hedge | Designated as hedge
Derivatives, Fair Value [Line Items]
Estimated fair value of derivatives	[1]	$ 3.8	$ 3.3

[1] All derivative assets are presented in Other current assets or Other assets. All derivative liabilities are presented in Other current liabilities or Other liabilities.