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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
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Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangibles | $ 179.2 | $ 260.1 | $ 224.3
Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangibles | 46.7 | 44.9 | 40.2
Trade names |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangibles | 16.4 | 16.6 | 14.4
Technology assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangibles | 18.6 | 16.3 | 9.1
Definite Lived Intangible Assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Amortization of intangibles | $ 81.7 | $ 77.8 | $ 63.7

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- Definition 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. + References 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 + Details
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