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Goodwill and Intangibles, including DAC and VOBA, net - Summary of Changes in Carrying Amounts of Goodwill and Intangible Assets Including FGL's DAC and VOBA Balances (Detail) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Jun. 30, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Goodwill And Intangible Assets [Line Items]        
Cost   $ 1,389.2 $ 1,240.4  
Intangible Assets, Including Goodwill [Roll Forward]        
Beginning Balance, Goodwill $ 1,524.8 1,524.8 1,476.7  
Beginning Balance, Indefinite Lived Intangible Assets 1,215.9 1,215.9 1,178.1  
Beginning Balance, Finite Lived Intangible Assets 917.2 917.2    
Beginning Balance, Intangible Assets, Excluding Goodwill 2,683.7 2,683.7 2,729.1  
Goodwill, Acquired During Period   1,054.7 65.8  
Indefinite-lived Intangible Assets Acquired   341.5 46.7  
Acquisitions (Note 13)   526.4 70.2  
Goodwill, Impairment Loss   (28.3)    
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)   (31.9)    
Impairment of Intangible Assets, Finite-lived (31.9)   0.0  
Goodwill, Written off Related to Sale of Business Unit   (16.2)    
Indefinite-lived Intangible Assets, Written off Related to Sale of Business Unit   (9.9)    
Deferrals   320.1 239.0  
Less: Components of amortization:        
Amortization of Intangible Assets   (129.6) (179.2) $ (260.1)
Adjustment for unrealized investment (gains), net, Goodwill   219.7 (156.8)  
Effect of translation, Goodwill   (47.6) (17.7)  
Effect of translation, Indefinite Lived intangible assets   (25.3) (8.9)  
Effect of translation, Intangible Assets Excluding Goodwill   (49.6) (18.6)  
Ending Balance, Goodwill   2,487.4 1,524.8 1,476.7
Ending Balance, Indefinite Lived Intangible Assets   1,490.3 1,215.9 1,178.1
Ending Balance, Finite Lived Intangible Assets   990.0 917.2  
Ending Balance, Intangible Assets, Excluding Goodwill   3,528.9 2,683.7 2,729.1
Finite-Lived Intangible Assets, Accumulated Amortization   399.2 $ 323.2  
Periodic amortization        
Less: Components of amortization:        
Goodwill Amortization      
Amortization of Intangible Assets   (187.0) $ (232.1)  
Interest        
Less: Components of amortization:        
Amortization of Intangible Assets   34.0 28.6  
Unlocking        
Less: Components of amortization:        
Amortization of Intangible Assets   23.4 24.3  
Customer Relationships [Member]        
Goodwill And Intangible Assets [Line Items]        
Cost   985.2 877.1  
Intangible Assets, Including Goodwill [Roll Forward]        
Beginning Balance, Finite Lived Intangible Assets 672.5 672.5    
Less: Components of amortization:        
Amortization of Intangible Assets   (87.8) (81.7) (77.8)
Ending Balance, Finite Lived Intangible Assets   737.8 672.5  
Finite-Lived Intangible Assets, Accumulated Amortization   247.4 204.6  
Definite Lived Intangible Assets        
Intangible Assets, Including Goodwill [Roll Forward]        
Beginning Balance, Finite Lived Intangible Assets 917.2 917.2 985.1  
Acquisitions (Note 3), Finite-Lived Intangible Assets   184.9 23.5  
Impairment of Intangible Assets, Finite-lived   0.0    
Less: Components of amortization:        
Effect of translation, Finite Lived intangible assets   (24.3) (9.7)  
Ending Balance, Finite Lived Intangible Assets   990.0 917.2 985.1
Definite Lived Intangible Assets | Periodic amortization        
Less: Components of amortization:        
Amortization of Intangible Assets   (87.8) (81.7)  
VOBA        
Intangible Assets, Including Goodwill [Roll Forward]        
Beginning Balance, Finite Lived Intangible Assets 86.8 86.8 225.3  
Less: Components of amortization:        
Amortization of Intangible Assets   (21.8) (55.8) (137.0)
Adjustment for unrealized investment (gains), net, Goodwill   164.9 (82.7)  
Ending Balance, Finite Lived Intangible Assets   229.9 86.8 225.3
Finite-Lived Intangible Assets, Accumulated Amortization   348.1 326.3  
VOBA | Periodic amortization        
Less: Components of amortization:        
Amortization of Intangible Assets   (53.5) (92.4)  
VOBA | Interest        
Less: Components of amortization:        
Amortization of Intangible Assets   12.3 15.0  
VOBA | Unlocking        
Less: Components of amortization:        
Amortization of Intangible Assets   19.4 21.6  
DAC        
Intangible Assets, Including Goodwill [Roll Forward]        
Beginning Balance, Finite Lived Intangible Assets 463.8 463.8 340.6  
Deferrals   320.1 239.0  
Less: Components of amortization:        
Amortization of Intangible Assets   (20.0) (41.7) (45.3)
Adjustment for unrealized investment (gains), net, Goodwill   54.8 (74.1)  
Ending Balance, Finite Lived Intangible Assets   818.7 463.8 $ 340.6
DAC | Periodic amortization        
Less: Components of amortization:        
Amortization of Intangible Assets   (45.7) (58.0)  
DAC | Interest        
Less: Components of amortization:        
Amortization of Intangible Assets   21.7 13.6  
DAC | Unlocking        
Less: Components of amortization:        
Amortization of Intangible Assets   4.0 2.7  
Trade Names [Member]        
Goodwill And Intangible Assets [Line Items]        
Cost   238.6 171.1  
Intangible Assets, Including Goodwill [Roll Forward]        
Beginning Balance, Finite Lived Intangible Assets $ 110.1 110.1    
Less: Components of amortization:        
Ending Balance, Finite Lived Intangible Assets   160.5 110.1  
Finite-Lived Intangible Assets, Accumulated Amortization   $ 78.1 $ 61.0