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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
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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)

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- 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 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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- Definition 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624177-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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- Definition Amount of realized and unrealized gain (loss) of derivative instruments not designated or qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4CC -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL109998890-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959 + Details
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