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Derivative Financial Instruments and Hedging Activities - Schedule of Pre-tax Effects of Derivative Instruments (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Pre-tax gains (losses) on derivative instruments
Total pre-tax effects of derivative instruments	$ 2.3	$ (0.4)	$ (3.6)
Designated as Hedging Instrument | Cash Flow Hedging | Foreign Exchange Contract | Cost of Sales
Pre-tax gains (losses) on derivative instruments
Reclassified from other comprehensive income (effective portion)	0.6	1.3	(0.5)
Not Designated as Hedging Instruments | Foreign Exchange Contract | Miscellaneous, Net
Pre-tax gains (losses) on derivative instruments
Not designated as hedges	$ 1.7	$ (1.7)	(2.4)
Not Designated as Hedging Instruments | Interest Rate Contract | Miscellaneous, Net
Pre-tax gains (losses) on derivative instruments
Not designated as hedges			$ (0.7)

X

- Definition

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

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Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments.

+ References

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-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
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