Financial Instruments and Risk Management (Schedule of Fair Values of Derivative Instruments) (Details) - FX contract - USD ($) $ in Millions		Dec. 31, 2019	Sep. 30, 2019
Not designated as hedge
Derivatives, Fair Value [Line Items]
Estimated fair value of derivatives	[1]	$ 0.2	$ 0.4
Cash flow hedge | Designated as hedge
Derivatives, Fair Value [Line Items]
Estimated fair value of derivatives	[1]	$ (0.1)	$ 1.7

[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.