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Goodwill and Intangibles - Summary of Definite Lived Intangible Assets (Detail) - USD ($) $ in Millions	6 Months Ended
	Mar. 31, 2017	Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Document Period End Date	Mar. 31, 2017
Cost	$ 1,380.7	$ 1,387.7
Accumulated Amortization	(532.0)	(488.7)
Net	848.7	899.0
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	976.8	984.8
Accumulated Amortization	(327.2)	(302.9)
Net	$ 649.6	681.9
Customer Relationships [Member] | Weighted Average [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	18 years 6 months
Customer Relationships [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	2 years
Customer Relationships [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	20 years
Technology Assets [Member] | Weighted Average [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	11 years 2 months 6 days
Technology Assets [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	5 years
Technology Assets [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	18 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	$ 165.7	165.7
Accumulated Amortization	(96.9)	(89.1)
Net	$ 68.8	76.6
Trade Names [Member] | Weighted Average [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	11 years 4 months 12 days
Trade Names [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	5 years
Trade Names [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	13 years
Technology-Based Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	$ 238.2	237.2
Accumulated Amortization	(107.9)	(96.7)
Net	$ 130.3	$ 140.5

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- Definition

The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
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