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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 | 9 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Goodwill And Intangible Assets [Line Items] |  |  |  |
Document Period End Date |  |  | Jun. 30, 2017 |
Intangible Assets, Purchase Accounting Adjustments |  |  | $ 146.9 |
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 |  |  | (70.9) | $ (70.5)
Goodwill, Foreign Currency Translation Gain (Loss) |  |  | 3.7 |
Effect of translation, Intangible Assets Excluding Goodwill |  |  | 4.9 |
Ending Balance, Goodwill | $ 2,621.3 |  | 2,621.3 |
Ending Balance, Indefinite Lived Intangible Assets | 1,558.1 |  | 1,558.1 |
Ending Balance, Finite Lived Intangible Assets | 895.3 |  | 895.3 |
Ending Balance, Intangible Assets, Excluding Goodwill | 2,453.4 |  | 2,453.4 |
Periodic amortization [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Amortization of intangibles |  |  | (70.9) |
Finite-Lived Intangible Assets [Member] |  |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Purchase Accounting Adjustments |  |  | 65.8 |
Intangible Assets, Including Goodwill [Roll Forward] |  |  |  |
Beginning Balance, Finite Lived Intangible Assets |  |  | 899.0 |
Less: Components of amortization: |  |  |  |
Amortization of intangibles | (23.8) | $ (23.5) | (70.9) | $ (70.5)
Effect of translation, Finite Lived intangible assets |  |  | 1.4 |
Ending Balance, Finite Lived Intangible Assets | $ 895.3 |  | 895.3 |
Finite-Lived Intangible Assets [Member] | Periodic amortization [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Amortization of intangibles |  |  | (70.9) |
Indefinite Lived Intangible Assets [Member] |  |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |  |
Indefinite-lived Intangible Assets, Purchase Accounting Adjustments |  |  | 81.1 |
Less: Components of amortization: |  |  |  |
Indefinite-lived Intangible Assets, Translation Adjustments |  |  | 3.5 |
Accounting Standards Update 2015-16 [Member] | Goodwill [Member] |  |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  | $ 139.2 |

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