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Goodwill and Intangibles - Summary of Changes in Carrying Amounts of Goodwill and Intangible Assets Including FGL's DAC and VOBA Balances (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Goodwill And Intangible Assets [Line Items] |  |
Intangible Assets, Purchase Accounting Adjustments | $ 0.0 |
Intangible Assets, Including Goodwill [Roll Forward] |  |
Beginning Balance, Goodwill | 2,487.4 |
Beginning Balance, Indefinite Lived Intangible Assets | 1,490.3 |
Beginning Balance, Finite Lived Intangible Assets | 990.0 |
Beginning Balance, Intangible Assets, Excluding Goodwill | 2,480.3 |
Impairment of Intangible Assets, Finite-lived | 0.0 | $ 60.2
Less: Components of amortization: |  |
Amortization of intangibles | (23.6) | (20.5)
Effect of translation, Intangible Assets Excluding Goodwill | (11.4) |
Ending Balance, Goodwill | 2,478.1 |
Ending Balance, Indefinite Lived Intangible Assets | 1,482.8 |
Ending Balance, Finite Lived Intangible Assets | 962.5 |
Ending Balance, Intangible Assets, Excluding Goodwill | 2,445.3 |
Periodic amortization [Member] |  |
Less: Components of amortization: |  |
Amortization of intangibles | (23.6) |
Finite-Lived Intangible Assets [Member] |  |
Goodwill And Intangible Assets [Line Items] |  |
Finite-Lived Intangible Assets, Purchase Accounting Adjustments | 0.0 |
Intangible Assets, Including Goodwill [Roll Forward] |  |
Beginning Balance, Finite Lived Intangible Assets | 990.0 |
Less: Components of amortization: |  |
Amortization of intangibles | (23.6) | $ (20.5)
Effect of translation, Finite Lived intangible assets | (3.9) |
Ending Balance, Finite Lived Intangible Assets | 962.5 |
Finite-Lived Intangible Assets [Member] | Periodic amortization [Member] |  |
Less: Components of amortization: |  |
Amortization of intangibles | (23.6) |
Goodwill [Member] |  |
Goodwill And Intangible Assets [Line Items] |  |
Goodwill, Purchase Accounting Adjustments | (2.4) |
Less: Components of amortization: |  |
Effect of translation, Finite Lived intangible assets | (6.9) |
Indefinite Lived Intangible Assets [Member] |  |
Goodwill And Intangible Assets [Line Items] |  |
Indefinite-lived Intangible Assets, Purchase Accounting Adjustments | 0.0 |
Less: Components of amortization: |  |
Indefinite-lived Intangible Assets, Translation Adjustments | $ (7.5) |

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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 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 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=56944662&loc=d3e3602-108585 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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