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Goodwill and Intangibles, including DAC and VOBA - Summary of Definite Lived Intangible Assets (Detail) (USD $) In Millions, unless otherwise specified |  |  | 9 Months Ended |  |  | 9 Months Ended |  |  | 9 Months Ended |  |  | 9 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2013 | Sep. 30, 2012 | Jun. 30, 2013 Minimum [Member] | Jun. 30, 2013 Maximum [Member] | Jun. 30, 2013 Customer relationships [Member] | Sep. 30, 2012 Customer relationships [Member] | Jun. 30, 2013 Customer relationships [Member] Minimum [Member] | Jun. 30, 2013 Customer relationships [Member] Maximum [Member] | Jun. 30, 2013 Trade names [Member] | Sep. 30, 2012 Trade names [Member] | Jun. 30, 2013 Trade names [Member] Minimum [Member] | Jun. 30, 2013 Trade names [Member] Maximum [Member] | Jun. 30, 2013 Technology assets [Member] | Sep. 30, 2012 Technology assets [Member] | Jun. 30, 2013 Technology assets [Member] Minimum [Member] | Jun. 30, 2013 Technology assets [Member] Maximum [Member]
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cost | $ 1,226.4 | $ 1,038.0 |  |  | $ 879.4 | $ 796.2 |  |  | $ 171.5 | $ 150.8 |  |  | $ 175.5 | $ 91.0 |  |
Accumulated Amortization | (223.9) | (164.1) |  |  | (147.9) | (113.0) |  |  | (41.2) | (28.3) |  |  | (34.8) | (22.8) |  |
Net | $ 1,002.5 | $ 873.9 |  |  | $ 731.5 | $ 683.2 |  |  | $ 130.3 | $ 122.5 |  |  | $ 140.7 | $ 68.2 |  |
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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- 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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