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Derivative Financial Instruments - Fair Value of Outstanding Derivative Contracts in Condensed Consolidated Balance Sheets (Detail) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017
Derivatives, Fair Value [Line Items] |  |
Document Period End Date | Dec. 31, 2017 |
Derivatives designated as hedging instruments |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | $ 3.4 | $ 1.2
Derivatives designated as hedging instruments | Interest Rate Swap [Member] | Receivables, net |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 0.1 | 0.0
Derivatives designated as hedging instruments | Interest Rate Swap [Member] | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 2.1 | 0.4
Derivatives designated as hedging instruments | Interest Rate Contract [Member] | Accounts payable and other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 0.2 | 0.5
Derivatives designated as hedging instruments | Interest Rate Contract [Member] | Accrued Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 0.0 | 0.2
Derivatives designated as hedging instruments | Commodity swap and option agreements | Receivables, net |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 0.9 | 0.6
Derivatives designated as hedging instruments | Commodity swap and option agreements | Other assets |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 0.1 | 0.0
Derivatives designated as hedging instruments | Foreign exchange contracts | Receivables, net |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 0.2 | 0.2
Derivatives designated as hedging instruments | Foreign exchange contracts | Accounts payable and other current liabilities |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 1.3 | 2.3
Derivatives designated as hedging instruments | Foreign exchange contracts | Other Liabilities [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Total liability derivatives | 0.0 | 0.3
Derivatives not designated as hedging instrument |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | 3.8 | 1.5
Total liability derivatives | 1.5 | 3.3
Derivatives not designated as hedging instrument | Foreign exchange contracts | Receivables, net |  |
Derivatives, Fair Value [Line Items] |  |
Total asset derivatives | $ 0.4 | $ 0.3

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- Definition Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719 + Details
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- Definition Fair value, before effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4D -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=64830801&loc=SL51823488-111719 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226000-175313 + Details
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