Goodwill and Intangibles, including DAC and VOBA, net - Summary of Amortization Expense of Definite Lived Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2011
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 260.1	$ 224.3	$ 46.6
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	44.9	40.2	38.3
Trade names
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	16.6	14.4	12.6
Technology assets
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	16.3	9.1	6.8
Definite Lived Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Amortization of intangibles	$ 77.8	$ 63.7	$ 57.7

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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