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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 | 6 Months Ended
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Mar. 31, 2016
Goodwill And Intangible Assets [Line Items] |  |  |  |
Document Period End Date |  |  | Mar. 31, 2017 |
Intangible Assets, Purchase Accounting Adjustments |  |  | $ 1.2 |
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 |  |  | (47.1) | $ (47.0)
Goodwill, Foreign Currency Translation Gain (Loss) |  |  | (4.6) |
Effect of translation, Intangible Assets Excluding Goodwill |  |  | (14.1) |
Ending Balance, Goodwill | $ 2,473.8 |  | 2,473.8 |
Ending Balance, Indefinite Lived Intangible Assets | 1,463.8 |  | 1,463.8 |
Ending Balance, Finite Lived Intangible Assets | 848.7 |  | 848.7 |
Ending Balance, Intangible Assets, Excluding Goodwill | 2,312.5 |  | 2,312.5 |
Periodic amortization [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Amortization of intangibles |  |  | (47.1) |
Finite-Lived Intangible Assets [Member] |  |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Purchase Accounting Adjustments |  |  | 1.2 |
Intangible Assets, Including Goodwill [Roll Forward] |  |  |  |
Beginning Balance, Finite Lived Intangible Assets |  |  | 899.0 |
Less: Components of amortization: |  |  |  |
Amortization of intangibles | (23.5) | $ (23.4) | (47.1) | $ (47.0)
Effect of translation, Finite Lived intangible assets |  |  | (4.4) |
Ending Balance, Finite Lived Intangible Assets | $ 848.7 |  | 848.7 |
Finite-Lived Intangible Assets [Member] | Periodic amortization [Member] |  |  |  |
Less: Components of amortization: |  |  |  |
Amortization of intangibles |  |  | (47.1) |
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 |  |  | (9.7) |
Accounting Standards Update 2015-16 [Member] | Goodwill [Member] |  |  |  |
Goodwill And Intangible Assets [Line Items] |  |  |  |
Goodwill, Purchase Accounting Adjustments |  |  | $ 0.0 |

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