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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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Goodwill And Intangible Assets [Line Items]        
Document Period End Date     Jun. 30, 2016  
Intangible Assets, Purchase Accounting Adjustments     $ 3.0  
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)     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     10.7 $ 60.2
Less: Components of amortization:        
Amortization of intangibles $ (23.5) $ (22.3) (70.5) (64.0)
Effect of translation, Intangible Assets Excluding Goodwill     (13.2)  
Ending Balance, Goodwill 2,479.7   2,479.7  
Ending Balance, Indefinite Lived Intangible Assets 1,478.9   1,478.9  
Ending Balance, Finite Lived Intangible Assets 920.7   920.7  
Ending Balance, Intangible Assets, Excluding Goodwill 2,399.6   2,399.6  
Periodic amortization [Member]        
Less: Components of amortization:        
Amortization of intangibles     (70.5)  
Finite-Lived Intangible Assets [Member]        
Goodwill And Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Purchase Accounting Adjustments     2.0  
Intangible Assets, Including Goodwill [Roll Forward]        
Beginning Balance, Finite Lived Intangible Assets     990.0  
Impairment of Intangible Assets, Finite-lived     0.0  
Less: Components of amortization:        
Amortization of intangibles (23.5) $ (22.3) (70.5) $ (64.0)
Effect of translation, Finite Lived intangible assets     (0.8)  
Ending Balance, Finite Lived Intangible Assets $ 920.7   920.7  
Finite-Lived Intangible Assets [Member] | Periodic amortization [Member]        
Less: Components of amortization:        
Amortization of intangibles     (70.5)  
Goodwill [Member]        
Goodwill And Intangible Assets [Line Items]        
Goodwill, Purchase Accounting Adjustments     3.4  
Less: Components of amortization:        
Effect of translation, Finite Lived intangible assets     (0.4)  
Indefinite Lived Intangible Assets [Member]        
Goodwill And Intangible Assets [Line Items]        
Indefinite-lived Intangible Assets, Purchase Accounting Adjustments     1.0  
Less: Components of amortization:        
Indefinite-lived Intangible Assets, Translation Adjustments     (12.4)  
CorAmerica [Member]        
Goodwill And Intangible Assets [Line Items]        
Goodwill and Intangible Asset Impairment     $ (10.7)