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Financial Instruments and Risk Management - Derivative Instruments, Gain (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gain (Loss) Recognized in Income | $ (0.9) | $ 9.9 | $ 8.1 | $ 9.9 |
Not Designated as Hedging Instrument | Foreign currency contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Estimated Fair Value Liability | (1.0) |  | (1.0) |  | $ (0.1)
Gain (Loss) Recognized in Income | (1.3) | $ 8.7 | $ (0.2) | $ 10.0 |
Not Designated as Hedging Instrument | Foreign currency contracts | Other Items, Net | Divestment Business |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Loss related to hedge contract | $ 0.9 |  |  |  |

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- Definition The net gains or losses recognized for each transaction with the acquiree that was recognized separately from the acquisition of assets and assumptions of liabilities in the business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=117331979&loc=d3e41228-113958 + Details
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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=109980867&loc=SL5618551-113959 + Details
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