Goodwill and Intangibles, including DAC and VOBA, net - Estimated Amortization Expense for VOBA and DAC in Future Fiscal Periods (Detail) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013
Schedule Of Amortization Expense And Weighted Average Lives Of Identified Intangible Assets [Line Items]
2014	$ 78.5
2015	78.5
2016	78.5
2017	78.5
2018	78.5
VOBA
Schedule Of Amortization Expense And Weighted Average Lives Of Identified Intangible Assets [Line Items]
2014	47.1
2015	45.3
2016	39.6
2017	32.4
2018	26.4
2019 and thereafter	115.9
DAC
Schedule Of Amortization Expense And Weighted Average Lives Of Identified Intangible Assets [Line Items]
2014	29.8
2015	32.5
2016	31.7
2017	30.0
2018	28.1
2019 and thereafter	$ 169.9

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Amount of amortization expense expected to be recognized after the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

No definition available.

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- Definition

Amount of amortization expense expected to be recognized during the next 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=26713463&loc=d3e16323-109275

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Amount of amortization expense expected to be recognized during the fifth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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Amount of amortization expense expected to be recognized during the fourth fiscal year following the latest fiscal year for assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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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

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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

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