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Goodwill and Intangibles, including DAC and VOBA - Summary of Definite Lived Intangible Assets (Detail) - USD ($) $ in Millions	9 Months Ended
	Jun. 30, 2015	Sep. 30, 2014
Finite-Lived Intangible Assets [Line Items]
Cost	$ 1,406.2	$ 1,240.4
Accumulated Amortization	(379.9)	(323.2)
Net	$ 1,026.3	917.2
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	2 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	20 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	$ 992.0	877.1
Accumulated Amortization	(234.4)	(204.6)
Net	$ 757.6	672.5
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
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	$ 171.6	171.1
Accumulated Amortization	(73.2)	(61.0)
Net	$ 98.4	110.1
Trade Names [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	3 years
Trade Names [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	13 years
Technology assets [Member]
Finite-Lived Intangible Assets [Line Items]
Cost	$ 242.6	192.2
Accumulated Amortization	(72.3)	(57.6)
Net	$ 170.3	$ 134.6
Technology assets [Member] | Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	4 years
Technology assets [Member] | Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Amortizable Life	17 years

X

- 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.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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=26713463&loc=d3e16323-109275

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X

- 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=26713463&loc=d3e16323-109275

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- Definition

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.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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- Definition

Amount after 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=26713463&loc=d3e16323-109275

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