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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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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

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+ 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
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-Topic 210
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