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Goodwill and Intangibles, including DAC and VOBA, net - Summary of Definite Lived Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 Minimum | Sep. 30, 2014 Maximum | Sep. 30, 2014 Customer relationships | Sep. 30, 2013 Customer relationships | Sep. 30, 2014 Customer relationships Minimum | Sep. 30, 2014 Customer relationships Maximum | Sep. 30, 2014 Trade names | Sep. 30, 2013 Trade names | Sep. 30, 2014 Trade names Minimum | Sep. 30, 2014 Trade names Maximum | Sep. 30, 2014 Technology assets | Sep. 30, 2013 Technology assets | Sep. 30, 2014 Technology assets Minimum | Sep. 30, 2014 Technology assets Maximum
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | $ 1,240.4 | $ 1,229.6 |  |  | $ 877.1 | $ 885.9 |  |  | $ 171.1 | $ 171.6 |  |  | $ 192.2 | $ 172.1 |  |
Accumulated Amortization | (323.2) | (244.5) |  |  | (204.6) | (160.8) |  |  | (61.0) | (44.7) |  |  | (57.6) | (39.0) |  |
Net | $ 917.2 | $ 985.1 |  |  | $ 672.5 | $ 725.1 |  |  | $ 110.1 | $ 126.9 |  |  | $ 134.6 | $ 133.1 |  |
Amortizable Life |  |  | 1 year | 20 years |  |  | 15 years | 20 years |  |  | 1 year | 12 years |  |  | 4 years | 17 years

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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=26713463&loc=d3e16323-109275 + Details
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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=26713463&loc=d3e16323-109275 + Details
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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 + Details
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