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Goodwill and Intangibles, including DAC and VOBA - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2013 | Apr. 01, 2012 | Mar. 31, 2013 | Apr. 01, 2012 | Sep. 30, 2012
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Intangible assets amortization method |  |  | straight-line method |  |
Amortization of intangibles | $ (49.0) | $ (58.8) | $ (135.6) | $ (115.5) |
2014 | 78.5 |  | 78.5 |  |
2015 | 78.5 |  | 78.5 |  |
2016 | 78.5 |  | 78.5 |  |
2017 | 78.5 |  | 78.5 |  |
VOBA [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted average amortization period |  |  | 5 years 2 months 0 days |  |
Cumulative adjustments for net unrealized investment gains | 277.6 |  | 277.6 |  | 339.4
Amortization of intangibles | (16.8) | (41.0) | (75.7) | (77.5) |
2014 | 49.7 |  | 49.7 |  |
2015 | 45.6 |  | 45.6 |  |
2016 | 41.7 |  | 41.7 |  |
2017 | 35.1 |  | 35.1 |  |
DAC [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted average amortization period |  |  | 6 years 1 month 0 days |  |
Cumulative adjustments for net unrealized investment gains | 62.3 |  | 62.3 |  | 50.7
Amortization of intangibles | (12.1) | (2.0) | (22.7) | (7.6) |
Deferred sales inducements, net of shadow adjustments | 13.3 |  | 13.3 |  | 9.1
2014 | 17.7 |  | 17.7 |  |
2015 | 18.6 |  | 18.6 |  |
2016 | 17.9 |  | 17.9 |  |
2017 | $ 16.9 |  | $ 16.9 |  |
Minimum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted average amortization period |  |  | 1 year |  |
Maximum [Member] |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Weighted average amortization period |  |  | 20 years |  |

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- Definition Deferred sales inducements, net of shadow adjustments. + References No definition available. + Details
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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 Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 45 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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=6943989&loc=d3e3602-108585 Reference 3: 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 4: 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=7658586&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the third fiscal year following the latest fiscal year for 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)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense expected to be recognized during the second fiscal year following the latest fiscal year for 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)(3) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 + Details
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- Definition The amortization method of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar either by their nature or by their use in the operations of a company. The straight-line method is the preferred amortization method, unless another method better reflects the pattern in which the asset is consumed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 12, 13, 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 35 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=7658317&loc=d3e15372-109273 + 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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