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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Sep. 30, 2016
Related Party Transaction [Line Items]          
Document Period End Date     Mar. 31, 2017    
Long-term Debt $ 5,727.0   $ 5,727.0   $ 5,540.7
Fortress Investment Group [Member]          
Related Party Transaction [Line Items]          
Net Investment Income 0.3 $ 0.2 0.6 $ 0.5  
Fixed Maturities [Member] | Fortress Investment Group [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Due from (to) Related Party, Noncurrent 275.2   275.2   203.2
Net Investment Income 3.1 2.3 6.1 4.5  
Funds Withheld Receivables [Member] | Front Street Re (Delaware) Ltd. [Member] | Fortress Investment Group [Member]          
Related Party Transaction [Line Items]          
Related Party Transaction, Due from (to) Related Party, Noncurrent 18.5   18.5   $ 18.0
FGL [Member] | Jefferies [Member]          
Related Party Transaction [Line Items]          
Disposal Group, Including Discontinued Operation, Interest Income       $ 4.0  
FGL [Member] | Fortress Investment Group [Member]          
Related Party Transaction [Line Items]          
Disposal Group, Including Discontinued Operation, Interest Income   $ 2.0 $ 5.5    
Investment Income [Member] | FGL [Member] | Fortress Investment Group [Member]          
Related Party Transaction [Line Items]          
Disposal Group, Including Discontinued Operation, Interest Income $ 2.8