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Goodwill and Intangibles - Summary of Definite Lived Intangible Assets (Detail) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Sep. 30, 2016
Finite-Lived Intangible Assets [Line Items]
Impairment of Intangible Assets, Finite-lived	$ 0.0	$ 10.7
Document Period End Date	Jun. 30, 2017
Cost	$ 1,454.5		$ 1,387.7
Accumulated Amortization	(559.2)		(488.7)
Net	895.3		899.0
Finite-Lived Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Net	895.3		899.0
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	1,001.6		984.8
Accumulated Amortization	(344.3)		(302.9)
Net	$ 657.3		681.9
Customer Relationships [Member] | Weighted Average [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	18 years 5 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 7 months
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	(100.8)		(89.1)
Net	$ 64.9		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	$ 287.2		237.2
Accumulated Amortization	(114.1)		(96.7)
Net	$ 173.1		$ 140.5

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Topic 350
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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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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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