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Related Party Transactions - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Related Party Transaction [Line Items]      
Document Period End Date Dec. 31, 2016    
Long-term Debt $ 5,563.4   $ 5,540.7
Fortress Investment Group [Member]      
Related Party Transaction [Line Items]      
Net Investment Income 0.3 $ 0.3  
Fixed Maturities [Member] | Fortress Investment Group [Member]      
Related Party Transaction [Line Items]      
Related Party Transaction, Due from (to) Related Party, Noncurrent 228.6   203.2
Net Investment Income 3.0 2.2  
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 18.1   $ 18.0
FGL [Member] | Fortress Investment Group [Member]      
Related Party Transaction [Line Items]      
Disposal Group, Including Discontinued Operation, Interest Income   $ 2.0  
Investment Income [Member] | FGL [Member] | Fortress Investment Group [Member]      
Related Party Transaction [Line Items]      
Disposal Group, Including Discontinued Operation, Interest Income $ 2.7