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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, 2016 | Dec. 31, 2015
Goodwill And Intangible Assets [Line Items] |  |
Document Period End Date | Dec. 31, 2016 |
Intangible Assets, Purchase Accounting Adjustments | $ 0.8 |
Intangible Assets, Including Goodwill [Roll Forward] |  |
Beginning Balance, Goodwill | 2,478.4 |
Beginning Balance, Indefinite Lived Intangible Assets | 1,473.5 |
Beginning Balance, Finite Lived Intangible Assets | 899.0 |
Beginning Balance, Intangible Assets, Excluding Goodwill | 2,372.5 |
Less: Components of amortization: |  |
Amortization of intangibles | (23.6) | $ (23.6)
Goodwill, Foreign Currency Translation Gain (Loss) | (13.9) |
Effect of translation, Intangible Assets Excluding Goodwill | (21.8) |
Ending Balance, Goodwill | 2,464.5 |
Ending Balance, Indefinite Lived Intangible Assets | 1,459.6 |
Ending Balance, Finite Lived Intangible Assets | 868.3 |
Ending Balance, Intangible Assets, Excluding Goodwill | 2,327.9 |
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 | 0.8 |
Intangible Assets, Including Goodwill [Roll Forward] |  |
Beginning Balance, Finite Lived Intangible Assets | 899.0 |
Less: Components of amortization: |  |
Amortization of intangibles | (23.6) |
Effect of translation, Finite Lived intangible assets | (7.9) |
Ending Balance, Finite Lived Intangible Assets | 868.3 |
Finite-Lived Intangible Assets [Member] | Periodic amortization [Member] |  |
Less: Components of amortization: |  |
Amortization of intangibles | (23.6) |
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 | (13.9) |
Accounting Standards Update 2015-16 [Member] | Goodwill [Member] |  |
Goodwill And Intangible Assets [Line Items] |  |
Goodwill, Purchase Accounting Adjustments | $ 0.0 |

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